Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bcf4bf73db1491e…

MALICIOUS

PDF

83.2 KB Created: 2021-03-22 06:16:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d49a66ab5ae264c1e8a834069d5eb384 SHA-1: 731454daaab0d2e238474b599709b3998b8db808 SHA-256: 1bcf4bf73db1491e95c07ce8368b9d2eb538d60d5fe3deb3b1f910e151d94083
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 0.9996

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://xajibur.ru/123?utm_term=sqlite+android+insert+if+not+exists PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461770/normal_6019947da3bc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386092/normal_60152082bc8d1.pdfIn PDF document text
    • https://dawerofe.weebly.com/uploads/1/3/4/3/134361643/8298244.pdfIn PDF document text
    • https://bukekumagisalej.weebly.com/uploads/1/3/5/3/135333054/d8ae719.pdfIn PDF document text
    • https://devigumekumowir.weebly.com/uploads/1/3/4/3/134394761/1521955.pdfIn PDF document text
    • http://muzomabavima.medianewsonline.com/sole_e35_installation_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390092/normal_5fe823c1543fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448985/normal_604cebb1dbc4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469103/normal_60121708a6650.pdfIn PDF document text
    • http://fonudesuwobulud.mygamesonline.org/design_of_highly_loaded_axial_flow_fans_and_compressors.pdfIn PDF document text
    • http://xelamoxadavas.mywebcommunity.org/fascial_spaces.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470830/normal_603698a81173f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487916/normal_5fdd86c4ef73a.pdfIn PDF document text
    • http://jerevuxo.iblogger.org/cisco_security_interview_questions_and_answers.pdfIn PDF document text
    • https://nonexivibofopuv.weebly.com/uploads/1/3/4/6/134603010/maxexisememagopide.pdfIn PDF document text
    • https://xirovule.weebly.com/uploads/1/3/4/7/134749068/434fc8b94.pdfIn PDF document text
    • http://wimazosuwoxugij.66ghz.com/one_less_bell_to_answer_barbra_streisand.pdfIn PDF document text
    • http://nokiwurugibub.mypressonline.com/magofivabikopakuzukaja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tigagatu.atwebpages.com/nasupoderenejoxo.pdfIn PDF document text
    • http://gisevidar.rf.gd/how_do_you_get_your_sims_in_labor.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/asignatura_estatal.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_off00010865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10865 5200 bytes
SHA-256: a21f27df6d9e3c81066ce2394c21c40c479f3d45c0f16799a11a9f07172b502f
font_01_sfnt_off00011a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A25 10884 bytes
SHA-256: bc0a429231ef976825865ddd058d4cf909015502a9bb1c9068835f5bd0e2e8f8

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