Malicious PDF — malware analysis report

Static analysis result for SHA-256 88886bc5bb93a02c…

MALICIOUS

PDF

77.6 KB Created: 2021-05-15 20:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79c5c014d3e36fecc417296a171496d6 SHA-1: 7121153c48cce30cc0a0eab7f8fd87069b6ff40d SHA-256: 88886bc5bb93a02ce151d30bdec5824f3739cfc43c0db94c1c587bb50c069266
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of a URL with 'utm_term' indicates a potential phishing or malware distribution attempt. ClamAV and ML heuristics strongly indicate maliciousness, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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
  • 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://jumiwimov.ru/strik?utm_term=how+to+use+sharper+image+drone+dx-4
    • https://jigurojo.weebly.com/uploads/1/3/5/3/135321607/9c0f6a1b8e5d.pdf
    • http://shtangye.xyz/convert_unit_rates_worksheet_7th_gradeu1iqz.pdf
    • https://jojeditisiteso.weebly.com/uploads/1/3/1/6/131606373/rekepekegaw-kajofurekil.pdf
    • http://makeyourself.xyz/christmas_jazz_piano_sheet_music_freecxkss.pdf
    • https://cdn-cms.f-static.net/uploads/4459935/normal_60268255b871b.pdf
    • https://pudijeda.weebly.com/uploads/1/3/4/5/134586696/9617217.pdf
    • https://falerelijiwega.weebly.com/uploads/1/3/4/6/134612416/kafimuradekojo.pdf
    • https://bifulegipemafus.weebly.com/uploads/1/3/5/3/135312859/564c239fb59f04.pdf
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/semepokek-fapuj-kanorumafaletov-xiwopo.pdf
    • http://hightrade.club/the_bunny_hole_lismoreudagq.pdf
    • http://healthyforczechrepublic.site/heat_and_glo_electric_fireplace_insert45a1l.pdf
    • https://jabesukugadipo.weebly.com/uploads/1/3/2/8/132814964/fazere-lupagulexoraxid-zafagitit.pdf
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/sekex-lijadokubogek-gedav-kapupon.pdf
    • https://jefaganogebe.weebly.com/uploads/1/3/1/4/131437435/bizodatesolog.pdf
    • https://kiluzamomumu.weebly.com/uploads/1/3/5/3/135344913/toregewujiz_vatibinezodemud_laxuferojef_detux.pdf
    • https://dojibabebane.weebly.com/uploads/1/3/2/6/132682208/fekegizuwobexotuza.pdf
    • https://buginibonimej.weebly.com/uploads/1/3/2/7/132711973/kizegafine.pdf
    • https://dudunubute.weebly.com/uploads/1/3/4/1/134132035/jobukebinol.pdf
    • https://cdn-cms.f-static.net/uploads/4463532/normal_6066b75f9e0cd.pdf
    • http://secureappeal.com/ketumufilijatekowosodumipqslg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lerefub.rf.gd/how_to_fix_a_ge_stackable_washer_and_dryer.pdf
    • http://boxemoje.epizy.com/unbreakable_full_movie_dual_audio_480p.pdf
    • http://fanapokabu.rf.gd/fijefi.pdf
    • http://gefuxexo.epizy.com/20945602202.pdf
    • http://minudiginodege.epizy.com/bilevo.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f09f.bin
464e864d238786c9f50b5ddfe86faa0268eb9f6f7e30ff85ae5733edacb149e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 5584 bytes
font_01_sfnt_off00010398.bin
24539e212d7e259463a30dd6cf0779a262dbdc18a1002be3e4ce2ee090e31ab7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10398 10820 bytes

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