Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a6350f18f412be…

MALICIOUS

PDF

83.7 KB Created: 2021-04-08 01:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 84c23c9a60d05f9db38b0be93bf83ca2 SHA-1: 5deeb500af9faea3cbb7785df7432c4f19e80496 SHA-256: c6a6350f18f412be93a79309fcbdccc08e730c975142c48e81e1433ec4689e0d
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://golowaki.ru/wix?keyword=coding+interview+questions+narasimha+karumanchi+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/tiwumixe/fYKhjhd/beauty_fashion_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4531626/normal_5fec32987c3e4.pdfIn PDF document text
    • https://cdn.sqhk.co/sibamoxa/eijUws2/14496675731.pdfIn PDF document text
    • https://cdn.sqhk.co/duwewofowus/RJk9zzY/names_of_football_referee_positions.pdfIn PDF document text
    • https://cdn.sqhk.co/dijexovesaf/j4FKWnR/gun_shooting_3d_games_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415077/normal_602528b98ef20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487902/normal_603473bedede5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481408/normal_6054b138dda75.pdfIn PDF document text
    • https://cdn.sqhk.co/zomitokemip/9jahahd/rc_buggy_racing.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/halloween_activity_worksheets_printable.pdfIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_c681bdbe0ba343d3ae52e2055c12daf5.pdf?index=trueIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_b79bc38591fd4c50b38ee65c23aa2fa4.pdf?index=trueIn PDF document text
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_d2351717a6224a69b472d89ea000f534.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/towakog/asus_vivobook_e12_e203ma_laptop_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/guwokox.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/porque_no_se_puede_eliminar_una_conversacion_de_instagram.pdfIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_a88ca31a42d949ccbcda9419acc5488f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sezebepit/christmas_percussion_ensemble_music.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/python_setup.py_build_executable.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/traditional_puerto_rican_food_for_christmas.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_off000107ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BA 5816 bytes
SHA-256: 2bf7e0ecdaae8af0a93dc87bbe4138b6c496abcd4388b9673ba1f273ef820e3f
font_01_sfnt_off00011b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B69 11052 bytes
SHA-256: 5da1a8e97a09d7cad95174a868aeeb498dcd45841e33c431f3d1c64324ed5c49

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