Malicious PDF — malware analysis report

Static analysis result for SHA-256 179439755c4ffbb0…

MALICIOUS

PDF

69.3 KB Created: 2021-02-06 19:43:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e82c63fbff0fa7677ab2928fc70647f7 SHA-1: 4a5396687c882b390edd5056eadb63bf47344832 SHA-256: 179439755c4ffbb03e9e199fac1120014a704d61488143c0d56c942ed696eb01
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 hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful 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://bologen.ru/wb?keyword=mlb%20the%20show%2019%20online%20manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465938/normal_5fe8e2eaab270.pdfIn PDF document text
    • https://nezubarenegutel.weebly.com/uploads/1/3/0/7/130776328/firobope_nikawogoju_tuwigoxotug.pdfIn PDF document text
    • http://dakixofib.22web.org/restriction_enzyme_worksheet_answer.pdfIn PDF document text
    • https://nerapusu.weebly.com/uploads/1/3/1/4/131438180/65005c47ac8cd2.pdfIn PDF document text
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/3dd397a11b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387050/normal_5feceec8a0c9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402481/normal_5ff128a3dd756.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/hhbhagY/26635850446.pdfIn PDF document text
    • https://cdn.sqhk.co/zopimoforaja/fidjgha/earthlink_satellite_internet_reviews.pdfIn PDF document text
    • https://nidabiweni.weebly.com/uploads/1/3/4/8/134865500/gerul.pdfIn PDF document text
    • https://cdn.sqhk.co/potebuso/2oMYBib/47506723810.pdfIn PDF document text
    • https://mokegeninu.weebly.com/uploads/1/3/4/0/134017711/6dfda9f8b9.pdfIn PDF document text
    • https://gitufigekuxos.weebly.com/uploads/1/3/4/6/134634758/02bb4ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449009/normal_5ff0b30421023.pdfIn PDF document text
    • https://taxonegumogel.weebly.com/uploads/1/3/5/3/135330056/4e9eb3a1dba2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465938/normal_5ffa9ee509206.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nomekerileme.epizy.com/megudorudiwewu.pdfIn PDF document text
    • http://rimejaje.epizy.com/raxevinusavazuxuvani.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_off0000cfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB3 5272 bytes
SHA-256: 4371d3d8cb9c7e4f1ee13b80ee3fd7c41fc114f6d32a55ac5d6c34ee3d33c993
font_01_sfnt_off0000e197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE197 11300 bytes
SHA-256: 167cc31f9ab5d85c0a3a04bc7716d125aa957307ec9d28b28696968d502a78de

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