Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ad49139ddb5a86…

MALICIOUS

PDF

86.9 KB Created: 2021-04-12 08:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8dcf09a436cb56307f139fbbfd2c699e SHA-1: 508bf28568a4df94189578f17e47f68aa5fc7ab9 SHA-256: a1ad49139ddb5a8617b85596064bed5374ae4c8c571777fecaaf1fe8b308644d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to disposable hosting services and utilize UTM parameters, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ponafet.ru/strik?utm_term=optiplex+760+specs+cnet PDF link annotation
    • http://keto-s1.com/manual_testing_interview_questions_and_answers_cognizant9hjzd.pdfIn PDF document text
    • http://vienvozvrat.site/69316821177ykfw1.pdfIn PDF document text
    • http://artyom.guru/vizio_sound_bar_remote_not_workingwbtpf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/08ca8924-7d1a-49ba-9539-0742753cbed2/berowo.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/around_the_world_in_80_days_full_movie_in_hindi_download.pdfIn PDF document text
    • https://a86b13d2-a9ad-4039-ad74-10d2f7332aba.filesusr.com/ugd/6e2451_2719b41e536b41e689574179717d900e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/47991902839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ddb7985-9f91-4b8d-8e35-d86e6305b93c/acoustic_guitar_system_melodic_guitar_lessons_for_beginners_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a92bf69-830f-426b-b620-062108e3ba66/edgar_allan_poe_stories_about_death.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce1193b7-c8fb-45f6-868e-3568bdf4e307/tuxasobapuluwuvojo.pdfIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_f357599071eb409f8b11884f28f8dbb7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bda227fc-e49f-4633-bc56-743b88fc4904/pakusagotokesibope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ea62dcc-a04e-4297-a21c-e044f64000bf/sagemcom_fast_5260_slow_speed.pdfIn PDF document text
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_00c2044f8f0a463090953fff46a5893c.pdf?index=trueIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_0e6b127f87c646cf95cdd4f9a8074f01.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9792b2b-0596-4e51-920a-e4383c48f15e/75546427066.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa38f06a-1b8c-4c7d-ba36-3a833401442d/dna_the_double_helix_coloring_worksheet_answer_key.pdfIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_05b6e1317d2a497d8f3b4033cd34aa58.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/49a8ed2b-c165-4129-a950-c17abe5df3bf/what_is_the_importance_of_salt_water.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/778f5b9d-c331-4add-8337-65ce068fd68a/13940355987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/361a73a0-f30d-462c-ba57-27d42eecb59c/paxujaporomosazoteg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdbdbc9d-ce58-4a0b-8c0b-b9967692879c/10455618816.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c22ce45-54ea-4b4e-85c0-1ca06ad68d66/what_happened_to_yahoo_stock_symbol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6d69a34-d8d5-4f6d-b27a-4d40d6c85db4/6903446210.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8A 10856 bytes
SHA-256: 0c4e9a281f7dbb532ecbc5fe53648f505a402c6b629d0054ca409ce94c320f85
font_01_sfnt_off0001185d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185D 5092 bytes
SHA-256: 50cb459a8ed09d6de467b0f8dc58f5b822f09f8ba589eb8413253535df8a1cc4
font_02_sfnt_off000129d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D8 10596 bytes
SHA-256: db8cee6eef39c0f042615b64749a0424dc82e813a9b1d7513fa4f49da3002a2a

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