Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb319a5fe12c2205…

MALICIOUS

PDF

82.7 KB Created: 2021-04-05 16:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c14e198dc9b749f2cba3b199591036e SHA-1: 53f1f293babd6bb639562013220927a15a72d9de SHA-256: bb319a5fe12c2205319255f3a54e55f39fdeeefd07679b4dafc3e6086f04cb4a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/award?keyword=ach+mandate+format+pdf
    • https://wezedamuj.weebly.com/uploads/1/3/4/4/134480618/jitebawulub.pdf
    • https://cdn.sqhk.co/kiribikiv/iPhdwjb/patching_holes_in_wood_floors.pdf
    • http://lugirepapirizo.scienceontheweb.net/suvevegagakuk.pdf
    • https://cdn-cms.f-static.net/uploads/4380691/normal_6063b59754983.pdf
    • https://cdn-cms.f-static.net/uploads/4369165/normal_6035f8aca05b5.pdf
    • https://cdn.sqhk.co/teruzemoru/3ghwgju/27266839713.pdf
    • https://vowabogebem.weebly.com/uploads/1/3/0/7/130775978/a82ddb526.pdf
    • https://cdn.sqhk.co/fimirexuf/kDiigjg/65677021465.pdf
    • https://cdn-cms.f-static.net/uploads/4452372/normal_600b418650daa.pdf
    • https://cdn-cms.f-static.net/uploads/4404955/normal_605aee15d6555.pdf
    • https://cdn.sqhk.co/zinoliwomi/2ijicgi/12141888065.pdf
    • https://cdn.sqhk.co/bevoroxur/5jdItgi/total_party_kill_level_29_solution.pdf
    • https://cdn-cms.f-static.net/uploads/4418783/normal_60151e2843a8e.pdf
    • http://wafixevewitope.mypressonline.com/ccrn_study_guide_free.pdf
    • https://cdn-cms.f-static.net/uploads/4388412/normal_6041f7ff309e0.pdf
    • https://zavomafig.weebly.com/uploads/1/3/4/3/134356936/rarirawasomosa-kuwokakobowid-kuvoku.pdf
    • https://wodanosivowifig.weebly.com/uploads/1/3/4/5/134593279/vixuxig.pdf
    • https://zibesotisudub.weebly.com/uploads/1/3/5/9/135996238/199039.pdf
    • https://cdn-cms.f-static.net/uploads/4466408/normal_601e064b1b6ed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://furipurisebete.onlinewebshop.net/filmic_pro_manual.pdf
    • http://jekurur.atwebpages.com/99919522517.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee95.bin
fd60c17705c9a360ac18e2442336b51dc280285178a6b2bea8585b0ea4f6f526		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 5176 bytes
font_01_sfnt_off0001000c.bin
fccaecf7c135024a183108fd5e48e39915a0397178975decc5347acfd16632b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1000C 11456 bytes
font_02_sfnt_off00012722.bin
c3e869c982258b52cb523fa8855d721f52fee239273184788944a9dae5f7aec5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12722 16452 bytes

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