Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b880fecd3c3be0a…

MALICIOUS

PDF

79.0 KB Created: 2021-03-23 20:58:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cf1020432d5cc18f0f24ed4a4786f68 SHA-1: 6a06e99686c1467e4729a4c80b42b76eded7893c SHA-256: 5b880fecd3c3be0a3e0d66ccea40f2844aa5754183e51aa21e05e88198e3165d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to PDF files hosted on Weebly subdomains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be related to 'Macbeth ap multiple choice questions answers', likely a lure to attract search engine traffic. No scripts were extracted, but the PDF structure itself facilitates the redirection to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wix?keyword=macbeth+ap+multiple+choice+questions+answers
    • https://tekigeja.weebly.com/uploads/1/3/1/3/131384442/golovafaf.pdf
    • http://palopej.sportsontheweb.net/zotagom.pdf
    • https://pasikozadiru.weebly.com/uploads/1/3/1/3/131384374/wofudof.pdf
    • https://xonajuximo.weebly.com/uploads/1/3/5/3/135311854/zofine_zazum_piminif.pdf
    • https://gigotuvo.weebly.com/uploads/1/3/1/1/131164366/7801632.pdf
    • https://fekobuwag.weebly.com/uploads/1/3/1/8/131858403/43127a15443.pdf
    • https://puzapageduz.weebly.com/uploads/1/3/1/4/131453954/bedeputuz-miwugod.pdf
    • https://pibezenasa.weebly.com/uploads/1/3/1/4/131454503/8833058.pdf
    • http://mamafiposorugul.sportsontheweb.net/gagabagukuso.pdf
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/3832141.pdf
    • https://nokesopupikes.weebly.com/uploads/1/3/4/7/134767934/4928645.pdf
    • https://tatonipek.weebly.com/uploads/1/3/4/8/134874136/zolozufarozonid.pdf
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/nefejolexorovu-zonapogodu.pdf
    • https://tuvugeti.weebly.com/uploads/1/3/4/1/134108896/4350355.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bejikefowu/western_digital_my_cloud_home_duo_review.pdf
    • http://woranuganavot.myartsonline.com/los_protocolos_de_los_sabios_de_sion_casa_del_libro.pdf
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_437810fbd0474e7395b48e567c64e0b0.pdf?index=true
    • https://s3.amazonaws.com/jitimesolagun/fakerebuk.pdf
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_db72c7ab3d0f46d480eee40ccdd76ee2.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5dd.bin
a4871d76f4e48999ad02a4156986d19da0b42f59c9184834e4e8f46ccb3b4feb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 5536 bytes
font_01_sfnt_off000108a1.bin
22c1efd66bd628d8c39ede7c36b25c43abb5786bec36cadf0663443c4148ef9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108A1 10532 bytes

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