Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d7b8def9f03108…

MALICIOUS

PDF

81.5 KB Created: 2021-05-09 09:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9cf050d49ba983be208b286f9c16655 SHA-1: 23c8470ff5d442e9a8d0eec0d52894c6fcd05452 SHA-256: 17d7b8def9f0310813809b166163eed28dde4e3f9dc9531798f3c0e79bb575f8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The primary URL points to a page with a query related to calorie intake for children, likely a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan payload delivery. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

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://ponafet.ru/strik?utm_term=how+many+calories+do+5+year+olds+need
    • https://losanuritajog.weebly.com/uploads/1/3/4/7/134730792/29782a20a79a9fb.pdf
    • https://cdn.sqhk.co/gawisibiw/iingjhf/jekafisibizafapid.pdf
    • http://itawegan.space/kawuwipolixemuzumede75l6o.pdf
    • https://daradila.weebly.com/uploads/1/3/1/4/131438164/werusulijosizowubij.pdf
    • https://cdn.sqhk.co/barugogip/ghSuhIU/popular_online_computer_games_2000s.pdf
    • http://winemewimivo.22web.org/44901675036.pdf
    • https://zusadubojurumez.weebly.com/uploads/1/3/4/7/134703186/3995072.pdf
    • https://cdn.sqhk.co/gixenerusivu/igigIgc/magic_mods_skyrim.pdf
    • https://cdn.sqhk.co/rufomezin/djdjiP3/wikipedia_random_facts.pdf
    • http://katermore.ru/why_is_spectrum_internet_not_connectingzt8ys.pdf
    • http://dashcamtopbest.com/certificate_of_origin_form_dhl0ob92.pdf
    • https://vojimefijizudi.weebly.com/uploads/1/3/4/3/134310580/vepimijimabajalidur.pdf
    • https://cdn.sqhk.co/nivavepe/jgjiF2x/shuddering_attacks_definition.pdf
    • https://cdn.sqhk.co/jivapereb/XggVhdy/27452648096.pdf
    • https://cdn.sqhk.co/mujowofapubi/Ijcggii/paypal_account_limited_for_no_reason.pdf
    • https://kinijanara.weebly.com/uploads/1/3/4/5/134585029/dekebuxasuter_gewutesabujuf.pdf
    • http://bnl-jobs.com/how_to_get_ikea_cataloguew221d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://padekapekalerel.rf.gd/32430396262.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c5.bin
b73200e84548a0815364d00c3b141bb41e566d8275ed6705367adbed37b6bd70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 5072 bytes
font_01_sfnt_off000103ef.bin
ff210f5fa296cc0131a4d0703ffe1c886609552aedb47bec95438709d9b199fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103EF 10884 bytes
font_02_sfnt_off00012910.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12910 4324 bytes

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