Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ff65738cb8bf41…

MALICIOUS

PDF

80.4 KB Created: 2021-05-03 21:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 30ff8b9394728debbe8a4cfc6fe2175e SHA-1: 4fa9a4fa3d1bc0b946646bd8aedcf6f46404d54d SHA-256: 70ff65738cb8bf4147bc1738da8551c637c4166bb7d339e672252440951989a7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing attempt. It contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. One prominent URL, 'https://zajinet.ru/strik?utm_term=dir-615+password+recovery', appears to be the primary lure for password recovery, likely a phishing pretext. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://zajinet.ru/strik?utm_term=dir-615+password+recovery PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374963/normal_60466e03be213.pdfIn PDF document text
    • http://rollernefrit.xyz/why_is_my_heating_not_getting_hotku6ch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453327/normal_604e98aeb4476.pdfIn PDF document text
    • http://rubyshup.space/zikekedejabekiisa9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382772/normal_5fc9c160393ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_ea0ffe39bdca45338bb1f66868015794.pdf?index=trueIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_80f9634dfc504b7bb08e04c58345289e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b4269c-0c88-4393-9cfb-41e51ae6bae7/how_to_increase_mind_power_in_hindi.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_aedd548de25f45daae24709f61689c4d.pdf?index=trueIn PDF document text
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_9fa2b83da68e4600ac8845069a280bfe.pdf?index=trueIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_859ba807c2224549b4b94824e4b7c874.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d112b6a-3241-4818-b64d-68862f44e7d2/26359951529.pdfIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_34f0a376684443628d7742a8823c3e1f.pdf?index=trueIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_4b814d8fd1b3416d83da8b396cc0b17b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93ab6afa-8a50-4597-8721-cb4033547946/21641416614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1edb8a8e-7fac-4f1b-8904-46dba56b9ae0/what_is_the_disney_college_program_really_like.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d390c60-ab52-4233-9ff4-31b44bb7ed87/have_the_relationship_you_want_rori_raye.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae3601fe-ad93-43b3-affe-402c1b020ddc/francis_bacon_new_organon.pdfIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_42958ae9f34f4e9f90ec7d10a6a5bcce.pdf?index=trueIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_0455dd93284f46e38d1464895e9b9fff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e99ea12b-46f9-4116-9b27-8f5cb23dd5ce/492881114.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 5252 bytes
SHA-256: a104bdca0939901c9c28e0602ca454622fcbf5eb0408087d8f869a5d963b1526
font_01_sfnt_off00010190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10190 10792 bytes
SHA-256: 2700adcbcbf4b92cc94341e1a278397843ee042f378ca3aa9fd0ddcccc767713
font_02_sfnt_off00012667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12667 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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