Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab77e2941ff0d90…

MALICIOUS

PDF

72.8 KB Created: 2020-11-21 20:41:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 45fd1bc31c473cdee2736055892aaab2 SHA-1: 9e10bb3968cb2cdd8ec5d2129bebcc931cc362dc SHA-256: aab77e2941ff0d903b7fee0813a34e6cec7eb78037ed17dee111a8b7202414d0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/123?utm_term=bevel+gear+technical+drawing PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f8c73d65152c.pdfIn PDF document text
    • https://nosekuge.weebly.com/uploads/1/3/2/7/132740467/nubupikof_rowobewelowevuv_kewari_folijosekazuje.pdfIn PDF document text
    • https://tijesefufejeje.weebly.com/uploads/1/3/4/8/134858706/tapabuvudowo.pdfIn PDF document text
    • https://xulavuxedipi.weebly.com/uploads/1/3/4/0/134017657/gusej-mobonaxagigar-xuwesusup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383928/normal_5f8ef4e7405ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448980/normal_5fb36c6e9bb31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424341/normal_5fa786b051a78.pdfIn PDF document text
    • https://rajaxamakato.weebly.com/uploads/1/3/2/3/132302926/f301b678bb3578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373243/normal_5f8cfe0251951.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369522/normal_5fb3024d8c11d.pdfIn PDF document text
    • https://govonomuvilikiw.weebly.com/uploads/1/3/4/6/134620083/327cc7762ec2b1.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/d8da5c0d-6659-4034-9d3e-980d3c2f4738/thank_you_mr_falker_comprehension_qu.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/english_grammar_book_for_class_12_up_board.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22e76386-f50d-487c-b1aa-9237cf26796b/what_does_the_number_next_to_isotope.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/40196494911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2eade98-f2ee-41ad-9295-0325ed84b9ee/morphological_species_concept_disadvantages.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_off0000c863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC863 5784 bytes
SHA-256: 2395dca5b8635a31984eaa2b96a06d66b8f5deda7e26f15f608d5abd835242ee
font_01_sfnt_off0000dc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC50 5224 bytes
SHA-256: f226d1d39cd9ed2bceafcae595d6c8e6676f24efc2317b35dbeaae0fd5e716f7
font_02_sfnt_off0000ee29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE29 11464 bytes
SHA-256: b12595122f8de27ae83d905cb1fddf3e31dfcae11029166090b41de2536f7172

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