Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e5d5759e8c1ea6…

MALICIOUS

PDF

75.2 KB Created: 2021-04-13 10:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 960ca2efa4e8932ab734cbf442449f32 SHA-1: 426aa3b1a4535ed13eb8979e5e9377ab22d0558c SHA-256: 64e5d5759e8c1ea68b554ce31a300cffc0ae786f6e25c2ba84f0a06d958ebdee
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the ML classification strongly indicate a phishing or malware distribution attempt.

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://nipisod.ru/strik?utm_term=gas+heater+installation+cost PDF link annotation
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://gagapazu.scienceontheweb.net/57301102393.pdfIn PDF document text
    • https://vabebixeteguju.weebly.com/uploads/1/3/4/2/134234611/6371524.pdfIn PDF document text
    • http://idealicaitalia.website/runescape_f2p_dungeoneering_guide_1-_9950alw.pdfIn PDF document text
    • https://zogugixuwomu.weebly.com/uploads/1/3/4/2/134234599/puwuvozugofarazeboza.pdfIn PDF document text
    • http://pekibimige.mygamesonline.org/native_american_history_for_dummies.pdfIn PDF document text
    • http://scoretdho.best/96146026443rvwlf.pdfIn PDF document text
    • http://xsafak.com/riduwegezuwalam3dj6.pdfIn PDF document text
    • https://taxebalipawixu.weebly.com/uploads/1/3/4/5/134598188/5116895.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://maxafatuvapare.rf.gd/around_the_world_in_80_days_1956_full_movie_123movies.pdfIn PDF document text
    • http://woxesuguve.epizy.com/23870217653.pdfIn PDF document text
    • http://gevejonitu.onlinewebshop.net/how_do_i_use_my_phone_as_a_remote_control.pdfIn PDF document text
    • http://zevesijuduma.atwebpages.com/94188543678.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_3d79837302474ec18fe876d9ca646363.pdf?index=trueIn PDF document text
    • http://penisidisipifo.rf.gd/niroxukepo.pdfIn PDF document text
    • http://nirisibibeso.epizy.com/4th_grade_ela_standards_tn.pdfIn PDF document text
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_44459084be1a464cbabd81fa4e75f6a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/dufozufebefetas.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/interview_with_a_vampire_book_age_rating.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_off0000eab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB1 4920 bytes
SHA-256: 6a6d9f0fd4978d9132ca97a4b2e18b5c3f957caf321235833f2d707d5c7abf3b
font_01_sfnt_off0000fb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB64 10672 bytes
SHA-256: 525e93e820187c7dac54362829aa2dfc2638c8a96044805552cbc6a68890ca94

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