Malicious PDF — malware analysis report

Static analysis result for SHA-256 a552e01cda6ef083…

MALICIOUS

PDF

67.6 KB Created: 2021-02-27 00:09:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4cd73373baed9e114a78e06e09de0f6c SHA-1: 7a37c0a1d9356f1b5e71c251890281f0ed56290a SHA-256: a552e01cda6ef083c817d8d2cf05e172f53fb0f0d45bf6ce76b9bc0795556f10
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'Grammaire progressive du francais intermediaire', likely a lure to disguise the malicious intent. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate an attempt 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://zajinet.ru/wb?keyword=grammaire%20progressive%20du%20francais%20intermediaire%20corriges%20pdf PDF link annotation
    • http://kinoxca.xyz/nevegadotuxikazepuvkrb37.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/diaqmje/4_band_snake_puzzle_ring_solution.pdfIn PDF document text
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/gifafafagelero.pdfIn PDF document text
    • https://cdn.sqhk.co/dufelogaruf/rnmyQib/16182268781.pdfIn PDF document text
    • http://copyright-helps-team.com/bangla_golper_boi_free_downloadrs1a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403541/normal_5fe8b54b7efdb.pdfIn PDF document text
    • https://kofagegupuk.weebly.com/uploads/1/3/2/3/132302723/zelototij.pdfIn PDF document text
    • http://winoorama.website/bujixuxepobejopifexir7gey.pdfIn PDF document text
    • https://cdn.sqhk.co/dirotiweze/iPjhhiG/tai_game_exploration_craft_hack_apk.pdfIn PDF document text
    • http://kostlike.site/amor_de_inviernon9was.pdfIn PDF document text
    • https://cdn.sqhk.co/nurofiwele/gcugeGx/magnetic_chess_set_near_me.pdfIn PDF document text
    • https://dulewidojupetor.weebly.com/uploads/1/3/2/6/132695372/4973950.pdfIn PDF document text
    • https://cdn.sqhk.co/tajixixejafi/jeqjehd/real_basketball_manga.pdfIn PDF document text
    • http://wellwork.site/race_car_simulator_game_online_free19mg3.pdfIn PDF document text
    • https://cdn.sqhk.co/mewedenemez/Bywgi6v/viking_saga_new_world_level_2.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/ODFjdgd/atv_dirt_bike_xtreme_racing_videos.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_off0000cb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB76 5536 bytes
SHA-256: 3d8fad43298f8821cfd1f63577ab778fa972563f83b3195ea12b62162b75a0fb
font_01_sfnt_off0000de3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3E 10112 bytes
SHA-256: b39dab9c4e439db292a6fc51457606fa67a073112b96df4f8c54e271ea9edf1e

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