Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e2959aed9ce0c3…

MALICIOUS

PDF

81.5 KB Created: 2021-05-22 05:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a3fb7438654d570fee62c3facd9dc412 SHA-1: 230d129cd920d734194091c7ee1b354b061679da SHA-256: d6e2959aed9ce0c3b8b0cc5fdc99c39b00bf171e6e0666a1647bcea963c53489
156 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 PDFs hosted on cloud storage services, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://fokemale.ru/strik?utm_term=how+to+pair+brookstone+bluetooth+headphones', is likely malicious and serves as the primary lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://fokemale.ru/strik?utm_term=how+to+pair+brookstone+bluetooth+headphones PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4503390/normal_5fc9dccbef185.pdfIn PDF document text
    • https://gunarolapikomi.weebly.com/uploads/1/3/4/4/134442839/bfeec7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475208/normal_6064a1bc83ea2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493569/normal_60522b14d77be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417986/normal_602073fd20045.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454171/normal_5fdfd94b560b0.pdfIn PDF document text
    • https://gijopufiri.weebly.com/uploads/1/3/1/3/131384250/berijufar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/76899399383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31f85268-47d3-4162-8c5d-d62bfb797abd/juwiwimusedaxev.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/kozivesosotila.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/rolitawawivipefuwujarawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b06fd31-1404-4851-a07d-71ad31801fd7/is_gdp_equal_to_revenue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/938f2f13-74f0-4c4f-b1b8-d32902567154/58775528532.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/30596874220.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/seeleys_essentials_of_anatomy_and_physiology_10th_edition_citation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/317959d5-1b74-4431-834b-10886aeb9c33/java_8_concurrency_tutorial_with_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/act_up_clean_version.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/dark_souls_remastered_ps4_review_ign.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/98283132096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/516918ea-d1ae-4adb-a6f8-e9f089646577/1331484262.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/love_story_tenor_saxophone_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc20dbf0-3e1a-4ed0-86cc-1462a4b29c0d/35922997879.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_off0000f470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF470 5184 bytes
SHA-256: ba26d6fce9d62b8f71eb404edbef8c155d3723204dbe1c4c1cd8c8288aa65505
font_01_sfnt_off00010601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 10812 bytes
SHA-256: 0f8872cdb68e00c1ca92138d96c0e7906d978d088bd7fc3ecb2dd59878439c64
font_02_sfnt_off00012a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A96 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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