Malicious PDF — malware analysis report

Static analysis result for SHA-256 647174e807590293…

MALICIOUS

PDF

82.3 KB Created: 2021-04-04 00:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d444867a30351f710dea12a2ab75dc7a SHA-1: 2006edde5b3652af85c11c9f1be69b0f84ae1b87 SHA-256: 647174e80759029326059f9c7b116eed17af3905a1938cdaa84fbbe80aa86989
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' and another flagging it as a phishing/trojan. The document body, though truncated and obfuscated, mentions a printer error fix, which is a common lure. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely to direct users to malicious sites for phishing or malware.

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/strik?utm_term=hp+5610+printer+cartridge+error+fix
    • http://azakalaza5.xyz/dragon_ball_z_fighting_games_apk2dbzj.pdf
    • http://republvinb.fun/bissell_bolt_vacuum_brush_not_spinningtx557.pdf
    • http://spencermcman.us/66591817996u5g8b.pdf
    • http://coins24h.com/how_to_fix_a_roomba_that_goes_in_circlescpi3o.pdf
    • http://banki-internetowe.com/hatha_yoga_asanas_benefitsq5pai.pdf
    • https://pilogowizimofog.weebly.com/uploads/1/3/4/6/134604263/8e58f7ee8d3c5.pdf
    • https://fuzewejobedogu.weebly.com/uploads/1/3/1/4/131482867/2744030.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • https://zanubago.weebly.com/uploads/1/3/4/8/134886268/wunazewizoxav.pdf
    • http://keepqifi.site/storm_front_album_cover4ls7j.pdf
    • http://naturebiolog.fun/29113040031lev5j.pdf
    • http://gbo.guru/7688518258b0xxb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jotogorurekuro/9823976409.pdf
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_13e551fff05b4e8db96707e41e6c01c7.pdf?index=true
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_e9e3e03957ff4b9a9626c8d1e4f00091.pdf?index=true
    • https://s3.amazonaws.com/mokuwanibof/how_to_properly_clean_carpets.pdf
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_5ff09b235dcc451088c7e5bfa3b322e2.pdf?index=true
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_1acd155157a3436981e3743d9f4a7399.pdf?index=true
    • https://s3.amazonaws.com/lebaxa/ergotamine_davis_drug_guide.pdf
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_71731fda0d2c49fa8e403c886c0eb14b.pdf?index=true
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_1d3dff62a2df4bfc96f23ecbe1afa7f5.pdf?index=true
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_9d4f24e90a66461a9a82c5fd13a2554c.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_off000103d6.bin
053f769f63a771ded6c3cca981c91a5d00a926d32f3e86e5210123512b033453		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 5616 bytes
font_01_sfnt_off00011719.bin
cebe318d15859d75f791e78257eef456a21e39671e568f5cb9b789f1d00aae9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11719 10892 bytes

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