Malicious PDF — malware analysis report

Static analysis result for SHA-256 634a6fc8caeb3de5…

MALICIOUS

PDF

74.5 KB Created: 2021-05-14 23:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 271881616cf4fedfb0b796c08b6f8744 SHA-1: dc6eadd76d7e3c5805b20330f98a9c48341ff5ed SHA-256: 634a6fc8caeb3de5dc486d17d8a0267f3f547ea5a1f9051baf59043b068b2963
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to obscure the ultimate destination or host malicious content. The embedded URLs are likely used to redirect users to phishing sites or download further malware.

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://pelibifir.ru/strik?utm_term=the+copyeditor%2527s+handbook+3rd+edition+pdf PDF link annotation
    • https://kepopuratitub.weebly.com/uploads/1/3/4/3/134378339/raguwokubiri-turadagedeg-kebawilinagum.pdfIn PDF document text
    • https://sikenobavusemel.weebly.com/uploads/1/3/2/6/132682861/f189a95cf.pdfIn PDF document text
    • https://xuwukixirekut.weebly.com/uploads/1/3/5/9/135966502/538429.pdfIn PDF document text
    • https://zeleveruki.weebly.com/uploads/1/3/4/8/134898901/4225833.pdfIn PDF document text
    • https://cdn.sqhk.co/xekowodu/b7hd3hg/couch_co_op_switch_games.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/4401564.pdfIn PDF document text
    • https://cdn.sqhk.co/jafakitiw/jriiKhb/strategy_definition_oxford_english_dictionary.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/akjIE3s/dafegedelinakoxi.pdfIn PDF document text
    • http://wofijolusiga.iblogger.org/depisufasugudizodaned.pdfIn PDF document text
    • https://bodupakodekafas.weebly.com/uploads/1/3/2/6/132680796/rafav.pdfIn PDF document text
    • https://worojuwoxalo.weebly.com/uploads/1/3/0/8/130814432/67f36d19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413345/normal_604b7ebe8dbe9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386094/normal_5ff758c4e4f25.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://be8f41f0-9ddd-434d-ab6d-aa755a40b80d.filesusr.com/ugd/726d9c_0b6dbeec53294b738a80a1a8638bc71c.pdf?index=trueIn PDF document text
    • http://sarirepenibe.epizy.com/15551839302.pdfIn PDF document text
    • https://034b020c-baab-45d1-b3ff-c950d21f9178.filesusr.com/ugd/3c93bc_d2f0e52d16cf40f29ec3371890635b22.pdf?index=trueIn PDF document text
    • http://mapakifexi.rf.gd/27306659755.pdfIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_7b09ada96dc143f3b92e6712dea0e0da.pdf?index=trueIn PDF document text
    • http://webuwerogoken.rf.gd/zajinamadofipesox.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_off0000e44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 5664 bytes
SHA-256: 1abfdfba8a2c1a55e868304d62ee37e5b1e34518c39196f9c9eb7ed0d93adbd3
font_01_sfnt_off0000f78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78C 10912 bytes
SHA-256: ecd593183500403eae77ede5f8e1a8055e49cefdc6c298dad6ea2828234bb42c

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