Malicious PDF — malware analysis report

Static analysis result for SHA-256 924581cf57a4120b…

MALICIOUS

PDF

72.7 KB Created: 2021-01-29 18:51:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 7f3c51377dc605a2deaa8bdfc4de9d66 SHA-1: 95b9baccacede527352537f32eca37e4ed7656ed SHA-256: 924581cf57a4120bce4e9e7b02736a99d8b02b621dd0303247e6ce4252abd3a0
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to known malicious redirectors or disposable hosting, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure designed to redirect users to malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=best+breakfast+in+key+largo In PDF document text
    • https://cdn-cms.f-static.net/uploads/4422180/normal_600fd6634cbde.pdfIn PDF document text
    • https://cdn.sqhk.co/noligigibar/djiibyi/beard_straightener_brush_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/jasojime/hdheHao/kiki_passo_fans_only.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489988/normal_5fe763bb5f424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383131/normal_5fdaabc5cf166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446399/normal_5fd2d3e073e29.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/u5YgeuP/pimuduvasofevofuwudokiga.pdfIn PDF document text
    • http://grusha.space/movies_free_2020_watch_hd_cinemalf4g6.pdfIn PDF document text
    • https://cdn.sqhk.co/musutalivun/bhdLhdi/fruit_master_throw_knife_mastery.pdfIn PDF document text
    • https://cdn.sqhk.co/vasinabew/fhficxS/xabazi.pdfIn PDF document text
    • https://cdn.sqhk.co/jeviseme/ieBKjbQ/snow_trails_app.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/iPhgihb/50964431907.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwaseja/L1gchbt/xopiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459166/normal_5fe5013200005.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lofadekiwi.rf.gd/bafegexaxipox.pdfIn PDF document text
    • http://sisawujeza.rf.gd/ruzofabiziwiza.pdfIn PDF document text
    • http://dajizipazubeva.epizy.com/banyan_tree_pic.pdfIn PDF document text
    • http://rowodebifofida.rf.gd/episode_new_guidelines.pdfIn PDF document text
    • http://fujebudavitasoz.epizy.com/ipcc_report_2019_plant_based_diet.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_off0000d3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B3 2968 bytes
SHA-256: 282f83d0d60058b38b336e634da764e773fa7d01c86c0f43c0161739672667ca
font_01_sfnt_off0000de5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5A 5288 bytes
SHA-256: 23d7d7bca54faabd0839d2a20d85a9d00a8399f3e19420892cc5c34316df9086
font_02_sfnt_off0000f07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07E 10812 bytes
SHA-256: 48eb1715f87d101e8265d275efaa064203d1e52dce3ca400a4673320ad227f3c

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