Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc07dc40948bb5c…

MALICIOUS

PDF

72.7 KB Created: 2021-03-14 14:10:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ee06cf5d3e6302037dc3bc23111b90a SHA-1: e6d720b22333d59b9b05a1df6aaa10eb3f4a6e1a SHA-256: 5cc07dc40948bb5c638f271652b0bf276f67c521c564f748a66d2ed869817ebe
164 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are part of a link farm designed to appear as legitimate search results. One prominent URL, 'https://seumenha.ru/wix?keyword=simulating+natural+selection+bean+lab+answers', is presented in a context suggesting a lure for information, likely a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/wix?keyword=simulating+natural+selection+bean+lab+answers
    • http://xafopawiki.medianewsonline.com/72801698822.pdf
    • http://vutunema.mypressonline.com/milegeliroxagele.pdf
    • https://cdn.sqhk.co/pazakazagoz/jaiLgjA/41322747384.pdf
    • https://gekiwudev.weebly.com/uploads/1/3/4/7/134769606/suronin.pdf
    • https://ganipomadajo.weebly.com/uploads/1/3/2/6/132695424/rupesurikerituw.pdf
    • https://cdn.sqhk.co/tazifawixax/bJhcgjo/renthoop_roommate_finder_georgia.pdf
    • https://cdn.sqhk.co/tedatekalo/jhhd4rf/pinball_games_for_sale_edmonton.pdf
    • https://bavopasivivewid.weebly.com/uploads/1/3/0/7/130738836/0fdd8fa5.pdf
    • https://migaxodilex.weebly.com/uploads/1/3/4/8/134852634/wetasokeneva-sewakud-tizevujukidozex-wokipekajojezo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_f003d4b2aaa34140b131f91e453bcbe9.pdf?index=true
    • https://s3.amazonaws.com/sixenogafopoj/72892014574.pdf
    • http://zoligagomuwe.onlinewebshop.net/pasizema.pdf
    • https://s3.amazonaws.com/faduxodiwo/lugupur.pdf
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_cfcc6d1f63e64f21af147a5366f63a86.pdf?index=true
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_b494862b334a496da712aa1c8a949e73.pdf?index=true
    • https://1e5cef04-603a-4a55-966b-a4237a424a2f.filesusr.com/ugd/b56239_1a2c10996a9d45eb83a0794aad2c82c3.pdf?index=true
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_21121af66ebf4bd58707aa016e67cb00.pdf?index=true
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_f3fe187169a942bf842f3796c5060e54.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_off0000ddd5.bin
e45e45c3d73ec94b5359c5602cdd4de9b8d8275b1524f0b7c9dc5a7246862243		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD5 5452 bytes
font_01_sfnt_off0000f058.bin
062efaadd38240b4606674b378d36d6aad10fb1742c687ee8695f766f4d2a195		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 10540 bytes

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