Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1dc0ca17a524197…

MALICIOUS

PDF

76.2 KB Created: 2021-04-18 10:40:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b2425ca3be65c53c3c9cd8c58f379ca6 SHA-1: 15e53c089c6e3c210f91a8f5309ecc45f7c31f91 SHA-256: a1dc0ca17a5241976ef5e07770522415f3be30d07be487e2f20a1901ec65fa17
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://soxebez.ru/strik?utm_term=how+to+use+an+ashford+joy+spinning+wheel PDF link annotation
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://xuzimelo.weebly.com/uploads/1/3/4/1/134132070/efd13bffe.pdfIn PDF document text
    • https://suguturame.weebly.com/uploads/1/3/1/4/131438741/josunosedibotanetafu.pdfIn PDF document text
    • http://lisolu.org/zuwajovuxorejagav0hueb.pdfIn PDF document text
    • https://cdn.sqhk.co/dusaradezat/ibhBEhf/kolelivadamorabumav.pdfIn PDF document text
    • http://wojournal.ru/harry_potter_wands_diy_woodx02dz.pdfIn PDF document text
    • http://pay-order.info/tuguwilarie62w.pdfIn PDF document text
    • http://legrand-spb.ru/zamumoge0p0g4.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/fDhcihZ/37008373508.pdfIn PDF document text
    • http://arenda-comp.space/82951315772hh6p4.pdfIn PDF document text
    • http://sibuvre.com/48059631483o3gig.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/jRngjhg/pevisekaxamuru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/56479466-8a72-4eb8-a4b4-560b341e8f5a/their_eyes_were_watching_god_chapter_17.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b584d4-4375-496c-b9c6-16c149b07794/best_family_court_lawyer_in_nj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/347e60d6-e0ed-452e-b7dd-accfb565796b/zefonisurazuwijonogax.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/joton.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1e0a062-aa1e-46f6-b3a8-23ca2ed1c5d6/60237253265.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/wukemajuzilid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bb4b055-6f34-4607-b42b-be22b36d0fb6/lanuvososuk.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86B 5536 bytes
SHA-256: 5086dcf7fa046f59c9e4949c3ae2fc85b611a92460df55f0985477d8d4f0cbea
font_01_sfnt_off0000fb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB58 11980 bytes
SHA-256: 27bf3bc32799728d0c1bb8bd677472d4e1cac1963746fd80e0e0b84bfe9a5beb

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