Malicious PDF — malware analysis report

Static analysis result for SHA-256 11dc223dd606301c…

MALICIOUS

PDF

82.5 KB Created: 2021-04-04 07:40:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 692682ddcf9440639bed1af14c8d47ff SHA-1: 7277ad7e8beeb9ff6fbd8c297d48f91eb952bd15 SHA-256: 11dc223dd606301c9c6131e4bd05ec51163bee5c6a5d3ed22f3e013cb5ff8a86
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, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to filter ratings, likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=what+does+the+merv+rating+on+filters+mean PDF link annotation
    • https://cdn.sqhk.co/ludozenidi/chMPijL/powerpoint_google_doc_template.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/sPhfhg3/speedy_clean_inc_appleton_wi.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/4hiia6F/artificial_intelligence_a_modern_approach_4th_github.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/dpSBhio/kalepafufebubugabimar.pdfIn PDF document text
    • https://cdn.sqhk.co/dukizukijire/PjgIHvZ/40751918721.pdfIn PDF document text
    • https://cdn.sqhk.co/xusawikorut/gdxmDja/nail_stugots_to_the_cross_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/ponatabet/lLjiSch/jump_rope_vs_running_knees.pdfIn PDF document text
    • https://cdn.sqhk.co/bumogebiz/f9uGja8/66989375796.pdfIn PDF document text
    • https://cdn.sqhk.co/vatuliwa/igygegj/61855714896.pdfIn PDF document text
    • https://cdn.sqhk.co/rukokota/jdhbVij/planet_zoo_sandbox_to_challenge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_d754d009c93c46719e0b2b7cb55a9acc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zupenafud/arch_linux_command.pdfIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_4f2dc023863b414b8e3c204fcd3873df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/penale/gimagivixulej.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/inductive_and_deductive_method_in_economics.pdfIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_a5b5d87447a94afab813327a443a7d26.pdf?index=trueIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_c8d16cfd25ed49ae890cef497ba80bce.pdf?index=trueIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_9efbbdbc2a764c988d5ac67a2d7f580c.pdf?index=trueIn PDF document text
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_d682de78bc8545ba9dc576aa98bc4ee1.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_off0001056b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056B 5396 bytes
SHA-256: 575c9bf91481df8adc06de1029a884feaf43797feb86d468515024a516eac1af
font_01_sfnt_off000117ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AD 10864 bytes
SHA-256: e9e72d2163f8ab515757385e097407663023a566975758cf668c764a7c275480

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