Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3e9f19ab55aae9…

MALICIOUS

PDF

81.8 KB Created: 2021-04-06 19:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b22009882a77958329622199ad249240 SHA-1: 2260c94a75087a6c5f33bed3e7e299b904d4fff3 SHA-256: 2a3e9f19ab55aae9d3e4d16db29ff71955e34607129d043b5066d8b3e2c63e55
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to disposable hosting and exhibiting characteristics of a link farm. 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 URL patterns suggest it's designed to redirect users to malicious content.

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://jumiwimov.ru/strik?utm_term=echo+pb-250ln+coil PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378613/normal_5fdad7ddd8ad2.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/jiieN12/kutojaja.pdfIn PDF document text
    • https://cdn.sqhk.co/riragimi/3OhcifM/black_panther_mask_tattoo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474456/normal_600bd3af4db89.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/hdAUhht/wedding_cake_topper_surfer_and_mermaid.pdfIn PDF document text
    • https://cdn.sqhk.co/rixosadiv/g5HIjch/primalcraft_cubes_craft_survive_game.pdfIn PDF document text
    • http://airet.space/84801634146csxmq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417997/normal_6002813e23d27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450512/normal_5feb4c1cd9083.pdfIn PDF document text
    • http://trokot-online.xyz/dunadifijozolekojjseri.pdfIn PDF document text
    • https://cdn.sqhk.co/torazanopuni/hddT1jb/love_pattern_lock_screen_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vajirasavuz/i5DOggE/digicel_play_multiscreen_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_601102e0c933f.pdfIn PDF document text
    • http://shop-profildoors.ru/tikesusakejaxecjhc8.pdfIn PDF document text
    • http://garantiya62.ru/removing_filter_on_frigidaire_dehumidifier85c3m.pdfIn PDF document text
    • http://varietystore.website/naza_m_lite_setup_guide90jr7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/30037560949.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/16915010755.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/ah44e_hall_effect_sensor_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/what_is_feminist_sociological_theory.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_off0001043b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043B 5064 bytes
SHA-256: 47898cef914f3eccd1d5b8bf4234357612f560dbca3fbae679bf122dca91f520
font_01_sfnt_off0001158b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158B 10804 bytes
SHA-256: b9b383553b5be2311afa66e9873fc7de744ba7a4e771a19401a9ace154a0ec96

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