Malicious PDF — malware analysis report

Static analysis result for SHA-256 613df064268b1e38…

MALICIOUS

PDF

134.0 KB Created: 2021-04-30 21:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9c0c592e2c575c384cb8fdbd7f80aeb6 SHA-1: cd2cc327e7e5266e153c425d46bbec98178d18cf SHA-256: 613df064268b1e386e093fe6379bc67d8e393a77d53ae04932dc42941a27c559
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to unknown or potentially malicious domains, indicating a link farm or phishing attempt. The presence of ClamAV detection and ML classification further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=diablo+3+barbarian+whirlwind+build+ps3 PDF link annotation
    • http://levantegroup.net/64345373127huytv.pdfIn PDF document text
    • http://ketotreno.buzz/out_of_the_loop_cat_memefg9kx.pdfIn PDF document text
    • http://a1metromovers.com/linokulojadorrt2l.pdfIn PDF document text
    • http://lazadacostumercenter.com/innovation_in_the_construction_industrykj69q.pdfIn PDF document text
    • https://nitevugumosu.weebly.com/uploads/1/3/4/5/134526644/mudopabujasosa-subumopusazep-subirosotafu.pdfIn PDF document text
    • http://titanof-filtr.ru/63192666783oyjn0.pdfIn PDF document text
    • http://onsideball.info/how_to_install_hp_deskjet_2544mctkb.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/3f892aa7-0fde-46f1-b029-ebc644104efb/tarot_card_spreads_for_self.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e91b371-6e3b-4e6b-9bc0-896ed03495c2/wokiwirafokakajonajow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c83c013-c779-4c7c-aff7-5e25a8155f8d/59506501696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e1b1fc8-120c-49ca-a91c-379869e910e1/49599468661.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a807aac3-20df-4d41-9e15-7a2ab8098361/the_big_book_of_questions_and_answers_ferguson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e4840f6-2017-4be8-99b4-def689abc7e1/46461348745.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7601dc4-8661-44a8-9958-f0302b1de54f/46266010189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eadd73a3-ab12-4e8c-964d-fe54c22eea0d/62660800412.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/178ea111-c7d3-43a5-b0f2-46abbf72088d/how_to_write_30_minutes_as_a_decimal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f45e955-0747-4452-af51-14f5d00a6948/how_to_get_original_birth_certificate_if_adopted_scotland.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e197982-7eba-4de6-ab23-57e2ae6acc08/samsung_ue_55_js8500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6f91901-07c1-459c-bd85-33be1fd8dbf0/sig_sauer_p226_scorpion_vs_legion.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6AA 6716 bytes
SHA-256: 88d5edde7b2b25878dd5490b7b71a6faf6c4e36cc7b80c91367d36f7b6e1f112
font_01_sfnt_off0001cd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD61 5444 bytes
SHA-256: 70125ff90445a57e9761328ea36d99e1b6847f960201efea6edafe9500d946b7
font_02_sfnt_off0001dfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DFE8 12856 bytes
SHA-256: c8ba79076d6852ad0e0075a5026f26f966a24b7c518f92d8813cc2f17dec3ba5