Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a1025f376ead3a…

MALICIOUS

PDF

82.7 KB Created: 2020-12-24 20:11:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 627d33a21f430817b0ffd0881f659e8d SHA-1: e9a63cd9b5c2fdc7843c05fe3edf1c9dac1fb684 SHA-256: b1a1025f376ead3a1899dc2cd26a42892eeb8057d95e4e14c7ff5c9ca26f8ffa
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially malicious or SEO-manipulated external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://trafftec.ru/strik?utm_term=celebrity+cruises+2020+southern+caribbean PDF link annotation
    • https://belaputeze.weebly.com/uploads/1/3/4/5/134515271/4002bb106.pdfIn PDF document text
    • https://cdn.sqhk.co/lewivapawo/dujahgC/6260176141.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369656/normal_5f9ca8ca7fc14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393791/normal_5f960cdc9621c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420020/normal_5fd335e594db9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470677/normal_5fa4f63db2471.pdfIn PDF document text
    • https://mofesotuju.weebly.com/uploads/1/3/4/7/134712265/6572d7b41fa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454054/normal_5faf13e73978d.pdfIn PDF document text
    • https://wojowoseda.weebly.com/uploads/1/3/4/2/134266381/101644.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/701872ba-ca31-49da-8b0e-189f071c1783/persona_3_fes_the_answer_length.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39e759ae-d069-464a-bcd9-ef95bb1fbba3/car_crashing_games_free_online.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/77889587541.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000110fa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x110FA 24216 bytes
SHA-256: bf54e3f493ad34e33dd4f454d50ee3a06526b0744275a4593ebb64b0f4c20172
font_00_sfnt_off0000dac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC5 5308 bytes
SHA-256: ab91b090caadc9aac50b559bee5de1882536fec7ae47bbb59b40791f78b5ecba
font_01_sfnt_off0000eccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCC 10736 bytes
SHA-256: bfddd4da8c85d0564f8b72afff8b797445892d20deed4d85181abc2b1f76d133

Open this report in the interactive analyzer, or submit your own file for analysis.