Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a92421f522d8b5b…

MALICIOUS

PDF

86.6 KB Created: 2021-03-31 03:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d810f7c4d71758707d0f26c85923fe01 SHA-1: 599ab46cc39763e5c3a1cd8c0ee7c63a21ed2ea3 SHA-256: 4a92421f522d8b5b9510238ddcca35d020846dbad902f5e5cd32c859c4bfc4c6
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/award?keyword=perioperative+bridging+anticoagulation+in+patients+with+atrial+fibrillation+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465259/normal_6026667ae07c6.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/bujawufukim.pdfIn PDF document text
    • http://powerpoint4you.ru/20392724202hh924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424400/normal_5fdba9d4a1d75.pdfIn PDF document text
    • http://redit.fun/perfect_creamy_fluffy_mashed_potatoesn743a.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/62031169079.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405930/normal_6044698007d8e.pdfIn PDF document text
    • https://gefatute.weebly.com/uploads/1/3/5/3/135345711/5829604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414672/normal_60389392d2202.pdfIn PDF document text
    • http://5dradio.ru/xezukakulinive4731j.pdfIn PDF document text
    • http://gadatoreneperil.mygamesonline.org/87852932858.pdfIn PDF document text
    • https://xomitemekebok.weebly.com/uploads/1/3/4/8/134881854/21ca8caae9e8b0.pdfIn PDF document text
    • http://im-marceting.site/zejamidijakefjwbxv.pdfIn PDF document text
    • http://rojibitakuvekuw.scienceontheweb.net/ocarina_of_time_nintendo_player_s_guide.pdfIn PDF document text
    • http://natikolom.site/jessica_nigri_lingeriepdvwk.pdfIn PDF document text
    • http://daxavepevepa.mypressonline.com/4757773530.pdfIn PDF document text
    • http://lipexifinidoda.scienceontheweb.net/present_simple_present_continuous_exercises_upper_intermediate.pdfIn PDF document text
    • https://torejijifixoni.weebly.com/uploads/1/3/5/3/135335296/gelugivegimovusidu.pdfIn PDF document text
    • http://biwedujurar.mywebcommunity.org/english_for_business_communication_calicut_university.pdfIn PDF document text
    • http://item-get.top/how_to_reset_motorola_g7_without_passwords3vwr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409413/normal_605d7b80e97a0.pdfIn PDF document text
    • http://rezexepenoma.scienceontheweb.net/articles_exercises_for_class_2.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
    • http://viwuwijagabote.myartsonline.com/zimunujar.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_off00010517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 5592 bytes
SHA-256: 539166e92fc7b3988191b390835687e0db4ea9dfef3ebbdaa68c42e261a97575
font_01_sfnt_off00011820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11820 11372 bytes
SHA-256: 53eada3563901dfc9847bff677720feeae0d564a152bc3f34c0bf8e7ddc126f9
font_02_sfnt_off00013e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E20 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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