Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91d712f37baece8…

MALICIOUS

PDF

82.7 KB Created: 2021-02-12 17:30:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 71f2bc80f849884f14f8069d94e1a4cd SHA-1: 066c37688ad83bd56dfffb50b8d03291ba0d4411 SHA-256: e91d712f37baece8c84c517e5020d80fb379904056c591389ddb1a904a91623f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to phishing sites or download further malware. The presence of external URIs and a link farm heuristic confirms the attack pattern.

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://baarspo.ru/123?utm_term=the+binding+of+isaac+the+forgotten PDF link annotation
    • https://buwefube.weebly.com/uploads/1/3/0/9/130969915/c5bfaae24f3.pdfIn PDF document text
    • https://lugifepitel.weebly.com/uploads/1/3/2/7/132710690/841548.pdfIn PDF document text
    • https://duvetuxivana.weebly.com/uploads/1/3/3/9/133999993/rawuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490122/normal_601f2bb23f144.pdfIn PDF document text
    • https://vinixojaz.weebly.com/uploads/1/3/5/3/135312356/6292628.pdfIn PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/lisepimonogidum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484997/normal_6019980d48aa7.pdfIn PDF document text
    • https://lolijizaw.weebly.com/uploads/1/3/4/4/134461821/6244329.pdfIn PDF document text
    • https://tolajugim.weebly.com/uploads/1/3/4/6/134647220/4786052.pdfIn PDF document text
    • https://livekurot.weebly.com/uploads/1/3/4/4/134443702/witanoduxedokoli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412591/normal_600b5bd97aea1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468274/normal_6017792378698.pdfIn PDF document text
    • https://mazogerivajusem.weebly.com/uploads/1/3/4/3/134341978/gutanimagajakew.pdfIn PDF document text
    • https://bopegaxuz.weebly.com/uploads/1/3/1/4/131406849/368334.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/pijavemodijilitojawuze.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/jafemenejozujaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/canadian_cardiovascular_atrial_fibrillation_guidelines.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_off00010374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10374 5340 bytes
SHA-256: 447b29a683490efdc426f626e28db9dabd2f7304330f663288df5f310d51962c
font_01_sfnt_off00011599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11599 11084 bytes
SHA-256: 2fe20cf6c0950ff06c281f45047f065c2c569252eec03b9d1470a3d515a96a9d

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