Malicious PDF — malware analysis report

Static analysis result for SHA-256 988d3f457206e3ed…

MALICIOUS

PDF

81.7 KB Created: 2021-03-02 20:14:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 1b4c39c0178f7173426086618036c527 SHA-1: 72d45bfea0ae12ac80110c1ee4a960cf5baf735c SHA-256: 988d3f457206e3edec0ab3902cf4d130d1b72c15b942ef8cb077afa149fbeee9
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains a large number of embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of 'utm_term' parameters in some URLs indicates tracking, common in phishing lures.

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://soxebez.ru/strik?utm_term=houston+texas+zip+code+harris+county PDF link annotation
    • https://mamunazeve.weebly.com/uploads/1/3/0/8/130814121/vobaxomuwowafo.pdfIn PDF document text
    • http://successinyourlif.website/escape_from_alcatraz_triathlon_shark_attackbyf75.pdfIn PDF document text
    • https://ziloboze.weebly.com/uploads/1/3/2/6/132683463/756169.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/software_tester_cv_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426059/normal_5fc674a2578cb.pdfIn PDF document text
    • http://italywom.space/79085182883en0gi.pdfIn PDF document text
    • https://cdn.sqhk.co/kapimetavis/iefp8fi/53668287254.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/56492225263.pdfIn PDF document text
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/zurigegeluvidif.pdfIn PDF document text
    • https://dogixosewe.weebly.com/uploads/1/3/4/6/134633635/de0da.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/hvjjia3/real_cooking_game_3d_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rosubeno/cusbnhl/kalnirnay_november_2020_marathi_calendar.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/zhhLrja/liverpool_latest_transfer_news_update_today.pdfIn PDF document text
    • http://bio-ita.fun/94263117582u3iek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nununad.myartsonline.com/stattraktm_m249_spectre_field-tested.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/72478280.pdfIn PDF document text
    • http://donijexufenu.onlinewebshop.net/kayla_itsines_ab_workout_cosmo.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_off00010196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10196 5312 bytes
SHA-256: b62b9d655f067be97611a0a5020106912a1910b773a7348d5f185351fafa4d91
font_01_sfnt_off000113aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AA 11524 bytes
SHA-256: 3d5e5b8932fa19d0bed5bb2b869416a1ecd3d278bbd2096e835fc6175a26d132

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