Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2adf372f247e993…

MALICIOUS

PDF

121.3 KB Created: 2021-05-30 22:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: d6919d4c4d40288e2b39f3b0830381d7 SHA-1: 270731010b37d71b8197ed9a8a52f3d09ebed538 SHA-256: b2adf372f247e99324ab144f04bf5e7460dec45daaca53699940f4c617f215e5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to facilitate the download or redirection to malicious content.

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://maypoin.ru/strik?utm_term=fce+writing+practice+test+pdf PDF link annotation
    • https://pajilolupifi.weebly.com/uploads/1/3/2/3/132302794/kofixo-xibitunawaxaja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476783/normal_5ff94a16d4f8b.pdfIn PDF document text
    • https://jokozoxusatolof.weebly.com/uploads/1/3/1/0/131070378/vemoj.pdfIn PDF document text
    • https://gojefofowuf.weebly.com/uploads/1/3/4/5/134596001/3897325.pdfIn PDF document text
    • https://wizejuxexena.weebly.com/uploads/1/3/4/6/134655833/duxakerewin.pdfIn PDF document text
    • https://dawofatodir.weebly.com/uploads/1/3/4/7/134756430/moparawes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459180/normal_5fefdcfe0fa48.pdfIn PDF document text
    • https://puxupukesif.weebly.com/uploads/1/3/0/8/130813524/2fa79224b1c2b7d.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/790b26b2-08a2-428d-b5c9-16d2999cfdac/freebitco.in_script_10000_roll_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b489b5c-26fb-4f28-bb4f-865ad7813c25/formal_dinner_invitation_letter_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/056d5289-4125-4774-a7d5-8282e92e453e/zorexafaliwob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b885ec4c-e982-4e78-aa11-f8a29054d1e8/reflexive_verbs_spanish_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55e31b9e-f2e0-4390-b24a-8fc0a6ea3fe6/arduino_mega_2560_tutorial_espa_ol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82d9af1f-1d0b-4658-ab09-0761cce27518/gym_program_for_beginners_female_weight_loss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1597d762-0735-400a-929a-cb47e86cad20/zasedenejikogumenumifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8137dd8b-e74b-44eb-acfa-0e3f29395afa/kefokenox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03489591-0900-4950-92b8-6e118de6f37a/netakipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eeeeb9a-e683-47c5-bdf0-136a93734a22/11763076230.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97f536dd-c4e2-4e2e-a172-f1831b91883a/19281672237.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_off00019de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DE5 5336 bytes
SHA-256: f954ebeb29363f6ee3c88f387c7e4656e6533397fe892a7abea24755aa63412b
font_01_sfnt_off0001b036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B036 11644 bytes
SHA-256: dd910956972cd56de955298ba0e10d2dc69cfe01415787c8676c9932c11c983c