Malicious PDF — malware analysis report

Static analysis result for SHA-256 a375642409197353…

MALICIOUS

PDF

81.1 KB Created: 2021-04-16 19:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6364dce94e2641640329c9d574a38d63 SHA-1: dd539618dfb535806c12bb3b21bf18a04434207d SHA-256: a375642409197353da0e18052dfc5785ec2244d36888970f92b2feff3e1c89d6
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains. The document's content and the presence of multiple SEO-related heuristics suggest an attempt to manipulate search engine results or lead users to phishing or malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=what+is+the+average+sat+score+for+ucla PDF link annotation
    • http://pusikoxelumide.iblogger.org/vinasogel.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/cdlLnfJ/dungeon_warfare_2_strategy.pdfIn PDF document text
    • http://noverst.xyz/what_is_the_best_chess_game_for_iphone1fh9g.pdfIn PDF document text
    • http://ionatr.fun/tufijabarubesodd2seu.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/eTArN7J/throne_of_glass_series_order.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/e0Fxw7o/fopanedogoke.pdfIn PDF document text
    • https://pevivifigevesiw.weebly.com/uploads/1/3/5/3/135315965/bcf1bd.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/iJ5hjFJ/wallpaper_love_heart_break.pdfIn PDF document text
    • https://bizataganuka.weebly.com/uploads/1/3/4/8/134852000/2c264241cdba1b.pdfIn PDF document text
    • https://tetusujofejami.weebly.com/uploads/1/3/2/6/132695476/ponuworag_pivogaji_wapefami.pdfIn PDF document text
    • http://kulinar2020.site/why_have_i_got_a_blood_spot_on_my_eyexx2gv.pdfIn PDF document text
    • https://petabururumeje.weebly.com/uploads/1/3/4/9/134902787/gumuwup-wefepube.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xidixisugatifes.epizy.com/50181268028.pdfIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_7abd5beb0ac146db93620b71f79227b2.pdf?index=trueIn PDF document text
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_ed6196a5b80b45108d322271201d8a6d.pdf?index=trueIn PDF document text
    • https://40c507a3-37b7-491f-afd3-f28ba3af1fb2.filesusr.com/ugd/7f5264_9c96fcaf09744c9faa9327417efef914.pdf?index=trueIn PDF document text
    • http://madixosapajob.epizy.com/5th_grade_math_worksheets_with_answers.pdfIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_401fb300221e493a9733dc04c5eee0b1.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DA 5216 bytes
SHA-256: bf17ae7866b15e56e7174123be77ae11bf5c6d0543a1d83d54184a714c004b4b
font_01_sfnt_off000112ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AC 10692 bytes
SHA-256: 42c2f294a0e645275050548f6b95a82fd3f08db838405c3ee0a80219284a6753

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