Malicious PDF — malware analysis report

Static analysis result for SHA-256 536292ab6451fb67…

MALICIOUS

PDF

69.4 KB Created: 2020-11-22 03:18:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 53d9ac10f8ec621fb54c39bc7f889b89 SHA-1: 123621e95b9493512a3125bf9ebbd6b28e883391 SHA-256: 536292ab6451fb672875a932114609e767c8c9212decc0d355662b88c140ea38
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files, many hosted on disposable domains, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. ClamAV also detected this file as Pdf.Phishing.Trojan, suggesting a phishing or malicious distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=biological+level+of+analysis In PDF document text
    • https://surinulijo.weebly.com/uploads/1/3/4/6/134648677/gifoxazikuvuxu.pdfIn PDF document text
    • https://nokurujifeseg.weebly.com/uploads/1/3/4/3/134355409/kusulerabimuvoziluz.pdfIn PDF document text
    • https://xuvaguwofivopi.weebly.com/uploads/1/3/4/4/134463587/5ec88.pdfIn PDF document text
    • https://lubebubekawi.weebly.com/uploads/1/3/4/7/134714091/2458701.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/lituwimu.pdfIn PDF document text
    • https://garigewofunem.weebly.com/uploads/1/3/4/3/134314314/pezez.pdfIn PDF document text
    • https://mimusazufuxor.weebly.com/uploads/1/3/4/5/134500801/2975c2ea75.pdfIn PDF document text
    • https://fikifiwokadekaw.weebly.com/uploads/1/3/4/5/134585034/efbcd.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/88be7ff576edae.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/pomaxa/order_of_the_lion_pathfinder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eea6c8a4-fc91-405e-b10e-96685d65aa22/41879537619.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/medical_parasitology_laboratory_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/526_area_code_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19a08073-430b-42be-962f-f10ed675f542/29296098007.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_off0000d1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DB 5164 bytes
SHA-256: 16160457d37fed8a6f75093582c6988363956dc3c99f97d19cd1843b983d56b6
font_01_sfnt_off0000e3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A6 10272 bytes
SHA-256: 965c3f8ef907e12835781cf34a367434934d7edde241697570e530b823f8d110

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