Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc837b9b76c9172…

MALICIOUS

PDF

80.0 KB Created: 2021-02-01 00:26:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f7cc335c20f416d1c52a9c007ef64ee0 SHA-1: ef1a0c81e37454bd94b13368d29bf1a18dab541a SHA-256: 5bc837b9b76c9172fff4a38c2efdef1e7174af1f0cc1a15733c98713f6295a96
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=jon-e+hand+warmer+amazon PDF link annotation
    • http://erkutungotu.com/lelukfhw7i.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/Dub4Sij/temple_run_oz_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/jagakutojut/ji0ecjh/gangs_of_london_review_empire.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/Do5Wfic/megatube_youtube_peliculas.pdfIn PDF document text
    • http://dfwshootersupply.com/93394093177lghwc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445550/normal_600294acaaec8.pdfIn PDF document text
    • http://tomandbxof.site/ikea_hemnes_8_drawer_dresser_organizern4uog.pdfIn PDF document text
    • http://bachanalytics.com/elizabeth_bennet_character_analysis_essaya8cti.pdfIn PDF document text
    • http://vinnipoh.space/112380578336uphq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470683/normal_5ff2286a0e906.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457005/normal_6011ad3e62c0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426697/normal_6016437a994bd.pdfIn PDF document text
    • http://begdas.fun/byzantine_agreement_problemdj0a3.pdfIn PDF document text
    • http://myluckybet.xyz/dependent_prepositions_exercises_b13w4h0.pdfIn PDF document text
    • http://dhl-order.info/domino_s_delivery_charge_vs_tip5dra1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384026/normal_5fd39b67bf291.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 5020 bytes
SHA-256: a881787c68b467180fb709a92f8ae11225403fa536d89e2c4879e232b84c616e
font_01_sfnt_off0000f8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A9 10840 bytes
SHA-256: 321c3b37bd583e11a00ec819bf8cc565b7e357a1ca65d5686bb14df4ae384c4a
font_02_sfnt_off00011dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD8 16160 bytes
SHA-256: 25a5e6c7c9cd73e1730f271d334b71b3c0ac6385951e3737251623a68d8eef5c

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