Malicious PDF — malware analysis report

Static analysis result for SHA-256 745351aa8ec13db8…

MALICIOUS

PDF

72.2 KB Created: 2021-01-11 08:10:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 9293bcfa25579060d1b057f4f5b839f6 SHA-1: d248328a96054fe1b1b1be4211aa1c94e2c1d577 SHA-256: 745351aa8ec13db8a50f6fb22a8cae5bd6ace0b583ceb79eb46de36faf1f67cf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and one specifically linked to a search term suggesting a lure for educational documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/aws?utm_term=bsc+degree+form+karachi+university PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f8c73a6d0df0.pdfIn PDF document text
    • https://site-1178965.mozfiles.com/files/1178965/67592622001.pdfIn PDF document text
    • https://site-1172723.mozfiles.com/files/1172723/elements_massage_mindbody_frisco.pdfIn PDF document text
    • https://site-1180062.mozfiles.com/files/1180062/pojog.pdfIn PDF document text
    • https://site-1166653.mozfiles.com/files/1166653/xebepadunalalebipifenod.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/ibXjhlf/evolutionary_approach_founder.pdfIn PDF document text
    • https://site-1168383.mozfiles.com/files/1168383/dialogflow_cx_webhook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490001/normal_5fd5f892a9cdd.pdfIn PDF document text
    • https://site-1194666.mozfiles.com/files/1194666/53179846117.pdfIn PDF document text
    • https://site-1198033.mozfiles.com/files/1198033/school_days_lyrics_persona.pdfIn PDF document text
    • https://site-1175458.mozfiles.com/files/1175458/solid_silver_diamond_cut_rope_chain.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382618/normal_5f8e72857043c.pdfIn PDF document text
    • https://cdn.sqhk.co/pevizopubok/fOCUjdt/bowman_2_infinity_archero_battle_pack.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/sajatesawodiji/direct_indirect_speech_examples_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/air_force_after_action_report_form.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_off0000d047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD047 5560 bytes
SHA-256: d20a1440e59311a477c620b7708bf394d14fcdfb5508bcd1d8e3a1b9a6ce4d0f
font_01_sfnt_off0000e313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 10184 bytes
SHA-256: 1849c8c34ba757549a3fdefb5fdf8fad809968170f843c68a911a79cca549a1d
font_02_sfnt_off00010579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10579 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

Open this report in the interactive analyzer, or submit your own file for analysis.