Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7d7f0cf0a7d251…

MALICIOUS

PDF

87.1 KB Created: 2021-04-05 02:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fded285f1a803e1a76c29b460ee4421f SHA-1: d38bd53ce5698a4a011582ee4886eca13130e914 SHA-256: df7d7f0cf0a7d2512e3d264e58d0860502e4d45c0063e64f2fa9cb77846db032
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or redirection attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs further supports a malicious intent to redirect users. No scripts were extracted, but the document's structure and URL patterns suggest it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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=is+there+a+vampire+diaries+book+series PDF link annotation
    • https://cdn.sqhk.co/radageroboko/Avz0yhj/mijumubinezifuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_6028cd6272ff1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474457/normal_5fc7cbae6dd97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416792/normal_60655cd50d0a5.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/59622691000j7iiz.pdfIn PDF document text
    • http://biotringel.shop/tisuromefebikagibaguris4vbbm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476580/normal_6037d3589f91f.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/dJEAij6/tataroxojozodipapo.pdfIn PDF document text
    • http://imkl-checker.com/xofugagavideax3d7.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/nfXZic3/logo_game_tv_channels_1_answers.pdfIn PDF document text
    • http://itdiscount.pro/20134634147tlots.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427795/normal_604e47e719d75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423462/normal_600bfc13e9fdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422877/normal_604e81606694d.pdfIn PDF document text
    • http://mydenverneighborhoods.com/how_do_i_factory_reset_my_vizio_tv_without_remoteehykv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kawotexulozax/64589911365.pdfIn PDF document text
    • http://kititone.epizy.com/95725121389.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/ariat_long_riding_boots_size_guide.pdfIn PDF document text
    • http://lufafutogixafu.rf.gd/restaurant_business_plan_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/ribujowegorexe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B89 5048 bytes
SHA-256: 6d5537026bc788ae39b5bf34a8d63deac5bf20d322440a896e067718c58d8285
font_01_sfnt_off00011cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAC 10728 bytes
SHA-256: 208b4ce5be520e94b031ee6e1ecb294dff46231d10d353c85df0a2f28799839c
font_02_sfnt_off00014143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14143 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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