Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e66ae1818b3fd3…

MALICIOUS

PDF

76.9 KB Created: 2021-03-02 21:24:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5632ad0c5ecbc8f9ebb39757c77e1b9f SHA-1: 57389ea7fde54721c2be7543bf4decc8e8ea71e3 SHA-256: 63e66ae1818b3fd3c98a1c4013dcb96bc7b1709e5c4a8023f4e5f52ade6b403d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that is flagged as external. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body, though partially corrupted, suggests a lure related to tablet reviews, which is a common tactic for social engineering.

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 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://vilenefex.ru/strik?utm_term=rca+pro%252B+10+hd+32gb+quad-core+tablet+reviews PDF link annotation
    • https://cdn.sqhk.co/gefimiwotux/uhfmMT0/movistar_play_argentina_app.pdfIn PDF document text
    • https://cdn.sqhk.co/pulijidapis/Figgin0/vetazi.pdfIn PDF document text
    • http://stnold.com/35690503903nhdql.pdfIn PDF document text
    • http://devgame.design/how_to_pair_ps4_gold_headset_with_iphonelt4wv.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/egiiQnw/scruffy_dog_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/idvhjcT/fawumelanigukaxaxidu.pdfIn PDF document text
    • http://5gusevshop.space/paderasos6p0in.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/92539194377.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/basedovamadutidekomokanajq73o0.pdfIn PDF document text
    • http://drive4mclanemilwaukee.com/aha_bls_questions_and_answers_2020o8ii7.pdfIn PDF document text
    • http://raifaisentapp.online/77931065386jyw9.pdfIn PDF document text
    • https://cdn.sqhk.co/sogefuluf/jhFjcig/69090290724.pdfIn PDF document text
    • http://e-sparks.ru/14383387973ha5rs.pdfIn PDF document text
    • https://cdn.sqhk.co/miropefaneka/yhcTxpL/cute_superhero_coloring_bookoli.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/kuxuxemu/56032126088.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_off0000eb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB32 6284 bytes
SHA-256: c073a1d9caa39690547b1386cf1f3e6d68dc4398c6a7494a71899b4df3740d7e
font_01_sfnt_off000100a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A4 11052 bytes
SHA-256: a4b61ecce1d375130e61324ed00f1dd28b5dc4a67a0f21e5368ce953769f14d1

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