Malicious PDF — malware analysis report

Static analysis result for SHA-256 a576d99c3bcff410…

MALICIOUS

PDF

151.7 KB Created: 2021-04-04 18:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: fa0cc769a3a0d80435cf9443d4b48a86 SHA-1: 0e4d45c9bbe1f45e9d62caff23ce26b3033347d6 SHA-256: a576d99c3bcff410c522009c7e64cfb56d56873b61271341488ed8dc89bf5a83
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or scam pretext, likely aiming to trick users into clicking malicious links or providing sensitive information. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://xezojetit.ru/wix?keyword=2004+pt+cruiser+manual+gas+mileage PDF link annotation
    • http://tehnotop.site/kark_seme_trkler_40_adet_mzikc2yzh.pdfIn PDF document text
    • https://cdn.sqhk.co/xomatujod/hihfieQ/best_offline_gps_navigation_app_2020.pdfIn PDF document text
    • https://gogipemefa.weebly.com/uploads/1/3/4/4/134471158/cc2822393496529.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/ecgeUbd/hide_n_seek_biscuit_recipe.pdfIn PDF document text
    • https://vakapivakanerij.weebly.com/uploads/1/3/4/4/134478061/2247099.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_6067816685e0b.pdfIn PDF document text
    • http://tophomework.space/word_formation_verb_noun_adjective_listdgo43.pdfIn PDF document text
    • http://centerbluebadge.com/supoxum17cxw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483082/normal_603ab1a2a6e15.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/sole_elliptical_e95_reviewsbwv3s.pdfIn PDF document text
    • http://microdigitalmeter.xyz/lunebobebolenonojukuwixid0w1fr.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/42823356233qld0p.pdfIn PDF document text
    • https://cdn.sqhk.co/gatezoru/gcRKhes/strategy_property_management_llc.pdfIn PDF document text
    • https://cdn.sqhk.co/rogapakaler/M8zqLgd/luxuvo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473616/normal_5ff78ee741c6a.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/0hgBSgN/music_video_creator_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fewisezux/jfqnJqJ/save_earth_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403680/normal_6012884344b01.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21247 5520 bytes
SHA-256: 011f561ef2a2a40c93b7e3c2fb9d0d84345f18fd798e750156aa4d264c24a62a
font_01_sfnt_off000224f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x224F8 13416 bytes
SHA-256: ebcbafd0a3292112caf592b3abbf997e62f26908c3376f9b58db2101b71ae368

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