Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5ae026b8d192af…

MALICIOUS

PDF

79.9 KB Created: 2021-03-19 06:53:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5a180861f686387dd7336c016e7fd5aa SHA-1: 4eda4cd36f5866442d7e6c84b28337860f461f3a SHA-256: ec5ae026b8d192afd56190158055f6a7316c6fb8b02658c8924d0e58bad703d6
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many hosted on disposable domains, which is a common tactic for phishing or SEO spam. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this 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://jacksth.ru/123?utm_term=ascom+platform+6.+2 PDF link annotation
    • https://cdn.sqhk.co/dosapupa/hg0ggig/slink._io_free_snake_games_unblocked.pdfIn PDF document text
    • https://rajezedej.weebly.com/uploads/1/3/2/6/132682549/cec27b95240c468.pdfIn PDF document text
    • https://kovorugoza.weebly.com/uploads/1/3/1/3/131383314/5082855.pdfIn PDF document text
    • https://kukutapiroboj.weebly.com/uploads/1/3/4/7/134712573/gaxigobixivakekupe.pdfIn PDF document text
    • https://konupalak.weebly.com/uploads/1/3/5/3/135315701/37778.pdfIn PDF document text
    • https://cdn.sqhk.co/fegadosijete/bieKggS/xivetibefetoj.pdfIn PDF document text
    • https://vegilumos.weebly.com/uploads/1/3/1/3/131383621/4d028746ea85b.pdfIn PDF document text
    • https://cdn.sqhk.co/todiwapubu/Wjhiahj/std_10_maths_textbook_gujarati_medium.pdfIn PDF document text
    • https://kuvugelovusilu.weebly.com/uploads/1/3/4/4/134437140/nivedadekexoz-wowuxesazosiv.pdfIn PDF document text
    • https://kapofered.weebly.com/uploads/1/3/2/6/132680839/waboxexorujogifug.pdfIn PDF document text
    • https://cdn.sqhk.co/famagafe/gfRnhd1/gagexazukizes.pdfIn PDF document text
    • https://cdn.sqhk.co/zativojor/ecG3Ht7/monkey_go_happy_6_level_10.pdfIn PDF document text
    • https://kuwumezebuxe.weebly.com/uploads/1/3/4/1/134131528/zefafesujagin_dodugodof.pdfIn PDF document text
    • https://cdn.sqhk.co/dobulefipuji/LCijcTM/my_octopus_teacher_netflix_documentary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_7772d331697340609777519f665a7d49.pdf?index=trueIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_4541ee68c83743d1980b602708d41571.pdf?index=trueIn PDF document text
    • https://a35b4eae-300a-44a5-b982-8d633984e519.filesusr.com/ugd/19735e_0ee9b2cc672447199ab0fadb85358aa3.pdf?index=trueIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_e19c2cc54e754f6cafd53dd6a7c30f97.pdf?index=trueIn PDF document text
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_6ffc8b4219c548bf95aba59af0cede84.pdf?index=trueIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_f782c9abd047438fa0643c29a97f4c34.pdf?index=trueIn 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_off0000f93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 5468 bytes
SHA-256: cb480d45fff358c15d0195772e887c32a9e9ffc1717d0ec0da75a7e8753753f9
font_01_sfnt_off00010bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC6 11624 bytes
SHA-256: 5de3c7de417ea083eccf5708f3dafe8cc2545e16ee9b88e2e0840a2f04427384