Malicious PDF — malware analysis report

Static analysis result for SHA-256 010a081910df8d88…

MALICIOUS

PDF

80.6 KB Created: 2021-02-25 22:15:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f082a15605b0e4e25faebe165730687f SHA-1: 25b5bbc89ea07739b6e91fdccb9c5bbc4449ddaf SHA-256: 010a081910df8d88827776a56f3fea4700a6e9449e0f8f2fbeb4673165b9d3bf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the attack pattern of using a link farm for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://leonvi.ru/strik?utm_term=can+i+use+an+if+formula+in+conditional+formatting PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419205/normal_5ff338e177a4b.pdfIn PDF document text
    • http://kemytbok.xyz/745630833074s8xi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501998/normal_5fe7a1be23ac7.pdfIn PDF document text
    • http://torchqbfl.fun/a_lesson_before_dying_quotes_chapter_1qve31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451018/normal_602305087f1b3.pdfIn PDF document text
    • http://shoop-fg.ru/metal_gear_rising_revengeance_apkherewn9f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415308/normal_5fe308cee0b20.pdfIn PDF document text
    • http://reduslim-europa.site/shatavari_plant_information_in_marathi8nb07.pdfIn PDF document text
    • http://autolombardpro.ru/nebumuzsz7i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477379/normal_601851c410fa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_6031f7db22a53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421462/normal_600b41a505041.pdfIn PDF document text
    • http://startbastar.online/lowiponulezopiwukeanae2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6C 5248 bytes
SHA-256: 3b4b65002f65c8ad685dab1d34067ab75099fe5d0bcbc6bfda0474845b85ca16
font_01_sfnt_off00010d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2B 11716 bytes
SHA-256: a1ca4699b4d20e6ce7d5b54bbbae296d0886131ab3c3c9605e00b47738348ea6

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