Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65b2af7894068df…

MALICIOUS

PDF

66.1 KB Created: 2020-11-13 14:29:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 66cab4cbbd8bed74b49897dc16b21288 SHA-1: db730a03a12d45a568218ea340fd3f7df3136493 SHA-256: f65b2af7894068dff221bcb42ba1a13d360818242129dc734d33f76d15676aba
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://trafffi.ru/strik?utm_term=furniture+liquidation+new+jersey PDF link annotation
    • https://zemaxuwoti.weebly.com/uploads/1/3/4/6/134694437/6600541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387562/normal_5fa6005354bf3.pdfIn PDF document text
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/d1fdc5184e8288b.pdfIn PDF document text
    • https://vepazigomopu.weebly.com/uploads/1/3/4/3/134398405/muziruginevufo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447649/normal_5f9eef0c2a195.pdfIn PDF document text
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/lodisuku.pdfIn PDF document text
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/miwijufusesi.pdfIn PDF document text
    • https://dovasumaba.weebly.com/uploads/1/3/4/6/134627072/9865314.pdfIn PDF document text
    • https://lolijigi.weebly.com/uploads/1/3/4/7/134700793/2456859.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/5f5ad3fe-34f9-41c0-9ea8-66df007e09b1/89934303952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aeb3e76-3545-42c1-bbb2-44edbc88fdfe/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e92382c2-553e-4dfc-8837-28415d691ae9/diwujabenivasadifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c884b55-5a3d-4158-989d-a7dc9762c6c3/sebastian_8_heart_event.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a93cf011-9137-4235-a0a2-ad36abd10bea/the_kite_runner_chapter_13_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34fd20ee-d30a-4295-b145-dfd28a2dac9c/bubexoxiter.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BE 5168 bytes
SHA-256: 2075d8daf5643dd2f3e781098d8e2a5d4306a14cf4b1220e1fbc76e18b678566
font_01_sfnt_off0000d878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD878 10380 bytes
SHA-256: fc609f7be04d38d76e1a58a3674fba01105a6a5e5e9ccee4719b3218c5dd8f08

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