Malicious PDF — malware analysis report

Static analysis result for SHA-256 d872012d0b1fc49f…

MALICIOUS

PDF

86.2 KB Created: 2021-02-23 16:37:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: fdbb367e7a9377d2f24b1bf6fa1d58f4 SHA-1: fdda91d3828078ff99b7a26340d23ddcd5f7aa63 SHA-256: d872012d0b1fc49f103672ebdf12ca7504c9d0abd59f7cd0eaa30d6238c60f91
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by a ClamAV detection and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including those on disposable hosting, suggests a link farm or redirection mechanism designed to lead users to malicious content. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the idea that the document is designed to trick users into downloading files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/wix?keyword=4.4+biomes+packet+answer+key PDF link annotation
    • http://ozalupa.space/philadelphia_flyers_schedulevh7aq.pdfIn PDF document text
    • http://ch-redirect.icu/grade_10_english_book_depedoc2kd.pdfIn PDF document text
    • http://yoga-fitness.space/nintendo_wii_rvl-001_games_downloadrt162.pdfIn PDF document text
    • https://cdn.sqhk.co/nerutamar/CZtheic/deck_wallet_for_clash_royale_arena_8.pdfIn PDF document text
    • https://lebivituwaw.weebly.com/uploads/1/3/1/8/131856954/79ac9d8ebd64eaa.pdfIn PDF document text
    • http://wonder-ita.space/jibogudodidiximarowuxofurhnm1.pdfIn PDF document text
    • https://cdn.sqhk.co/vebudirepo/hzqy6rL/mokikikuwanubuw.pdfIn PDF document text
    • http://idealica-uficialeitalia.website/windows_xp_activator_torrentnv1ni.pdfIn PDF document text
    • http://forpost-electrica.ru/rip_scary_math_teacher_field_trip_mod_apkvmeub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416805/normal_602e15f734435.pdfIn PDF document text
    • https://cdn.sqhk.co/zofagopipowi/ihfhgjj/33284139799.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380881/normal_5ffce1a72e7c5.pdfIn PDF document text
    • http://theplafond.xyz/fable_3_activation_key_unlock_request_code72pgt.pdfIn PDF document text
    • http://bet-info.ru/zixetazipafobuj3oa4w.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/retobifulipo/bijli_mitra_app.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/45123491041.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/murabenasarojodumanamu.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/86669654506.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_off0001122a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122A 5468 bytes
SHA-256: 8bdcc11fcd0073757e84b12586f1d6ee4ee8be50cedf57a49be069fe4df825cc
font_01_sfnt_off000124cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CC 11508 bytes
SHA-256: a6bb763c7e0feef77fd18e748335d0930db9c8dd866005dc125c1413c045efb7

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