Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5691574aaf37433…

MALICIOUS

PDF

86.0 KB Created: 2021-04-29 10:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cf98bc54f780afa01b666781ae40662f SHA-1: 5cec350279f83a38a1404388538daf72457c5282 SHA-256: a5691574aaf37433ebd945baaea55c9c9d90ce110cb655cf247e294c49e8826e
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 0.9997

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://fokemale.ru/strik?utm_term=best+sites+for+gmat+preparation PDF link annotation
    • https://rilulukopidu.weebly.com/uploads/1/3/5/3/135323077/9738984.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368751/normal_5ff7e67f852ed.pdfIn PDF document text
    • http://busapibasin.mypressonline.com/kaxekumavudaf.pdfIn PDF document text
    • https://ramageputa.weebly.com/uploads/1/3/1/6/131637054/8005984c23a4431.pdfIn PDF document text
    • http://jabofedu.sportsontheweb.net/98049672496.pdfIn PDF document text
    • https://tupokigefadewun.weebly.com/uploads/1/3/4/7/134702618/dixedesovolup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480579/normal_6056db7423521.pdfIn PDF document text
    • https://sujezebaxoxil.weebly.com/uploads/1/3/4/3/134316131/42604f5768efb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408878/normal_602e5d5b1a288.pdfIn PDF document text
    • https://zuzilumapodebaj.weebly.com/uploads/1/3/1/3/131382406/moropemej.pdfIn PDF document text
    • http://talajudoxuxip.mygamesonline.org/deed_of_sale_agreement.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454575/normal_5fdc09d027eff.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/f9a43a8f-bbec-43c0-b57f-d7815d8a6cbc/what_is_public_fiscal_administration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/974d4643-3c8f-4af7-9a7c-f2d6090d32be/lavibuxagifolefidiva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fc56207-6c45-4ef9-b401-383de4f57b2d/58600936584.pdfIn PDF document text
    • http://nowageg.onlinewebshop.net/26671590006.pdfIn PDF document text
    • http://mojigoka.atwebpages.com/anna_university_annexure_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1566b407-7d87-4aa5-9a22-8a2517e4f30e/exploring_the_bible_stephen_harris.pdfIn PDF document text
    • http://wufalejopasedor.epizy.com/bestway_coleman_lay-z-spa_saluspa_water_flow_sensor.pdfIn PDF document text
    • http://davobob.rf.gd/thank_you_mother_mary_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ec53682-67c2-45c0-9961-d148cbbe603d/john_scalzi_old_mans_war_film.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_off000114b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B1 5236 bytes
SHA-256: 5003a3eb844a3907c0023f8803393a34a6e66c2ad6233a6f3db14aab1fffc5cc
font_01_sfnt_off00012674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12674 10684 bytes
SHA-256: d89f51147cda8ac8c073eaa8e814cea122a681e1d156609c24dbebd1ed425438

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