Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad4077c77bc01c9…

MALICIOUS

PDF

71.6 KB Created: 2020-12-18 15:31:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7c8f21abe2d7659e6259be8d2c153bf8 SHA-1: 52d0e2ba528fe5ecf27c9ff72043ff17c70ea33c SHA-256: bad4077c77bc01c9a765fa82eb109561f52ac795055f9b72c8a3edec6c5d086f
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external link farm are indicative of techniques used to redirect users to malicious sites.

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://trafffe.ru/strik?utm_term=nyu+internal+transfer+deadline PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389616/normal_5faf335396119.pdfIn PDF document text
    • https://rukazoxet.weebly.com/uploads/1/3/4/0/134040508/97da9f0a415.pdfIn PDF document text
    • https://dezazobe.weebly.com/uploads/1/3/4/7/134755526/ceb951b47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502248/normal_5fcd5e556ab38.pdfIn PDF document text
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/xetowakovuzisegud.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/tesanoko.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/samesuseliju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fce8e0e799940555acba95f/t/5fd21aadeeaf2774ac94cbe0/1607604918035/sowixubivuwalotibufufiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94cf5bc1-e278-4c6d-b48c-3cff3f4a7b66/lupixogozugupewuladaminer.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/5829058546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad5cd5c6-00bc-48a0-814a-166f108146d8/9222499528.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5bfa2f7cf8c75404bf65f/t/5fd156bbf2ee360040e901d8/1607554748213/da_doo_ron_ron_shaun_cassidy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e231382d-7bca-4680-ad35-5b6d87caf555/zebexuviduxegijox.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/yugioh_field_spell_rules_2020.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_off0000dbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE3 4972 bytes
SHA-256: 6d676ecefd3c339fe69a3af1e965a5997ebb26ce3292f26a54f963d36fa6ec7b
font_01_sfnt_off0000ece8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 10660 bytes
SHA-256: 1749a8ac6772b70780862dcfff4830691f97b3627cffc5db9739acdc75893aa7

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