Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64daf03c97557f2…

MALICIOUS

PDF

87.5 KB Created: 2021-06-12 00:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6285ee6d657657cb9ffb46906f6bc9eb SHA-1: c8a9b50902229b50275c241bf6515ebaf51da992 SHA-256: a64daf03c97557f28111fd8a062976c0ba3ff5b71e47b34f2805526912dbc632
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to disposable hosting services and acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of many distinct hosts and UTM parameters suggests an attempt to obscure the ultimate destination or track user interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://archism.ru/pbw?utm_term=how+to+get+good+ending+jumin+route PDF link annotation
    • https://lipukafawo.weebly.com/uploads/1/3/4/3/134335084/28ae38737a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498992/normal_60493d31673d7.pdfIn PDF document text
    • https://sizemerekev.weebly.com/uploads/1/3/1/6/131606963/9977537.pdfIn PDF document text
    • https://vusesuke.weebly.com/uploads/1/3/4/7/134723580/binogavodu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382408/normal_5fccfd2cd5e19.pdfIn PDF document text
    • https://padipemoton.weebly.com/uploads/1/3/0/7/130739419/xazurupub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365652/normal_5fe0253851195.pdfIn PDF document text
    • https://kusugano.weebly.com/uploads/1/3/4/7/134740680/wafelotejasomepu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374199/normal_5fe9705cdef38.pdfIn PDF document text
    • https://xiduxerajul.weebly.com/uploads/1/3/4/6/134696605/0880fab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jotuwufo.pbworks.com/f/editing_passage_for_class_8_with_answers.pdfIn PDF document text
    • http://lodedeti.pbworks.com/f/truck_simulator_pro_europe_apk_download_free.pdfIn PDF document text
    • http://mosutit.pbworks.com/f/29525343821.pdfIn PDF document text
    • http://mogulazedub.pbworks.com/w/file/fetch/144497433/mweb_mail_settings_office_365.pdfIn PDF document text
    • http://kelivesas.pbworks.com/w/file/fetch/144440331/mashed_potatoes_recipe_homemade.pdfIn PDF document text
    • http://rajejor.pbworks.com/f/tere_liye_atif_aslam_mp3_song.pdfIn PDF document text
    • http://lodenapokot.pbworks.com/w/file/fetch/144701613/2002_yamaha_banshee_owners_manual.pdfIn PDF document text
    • http://xutipofapu.pbworks.com/f/bak_mei_kung_fu_manual.pdfIn PDF document text
    • http://supijexed.pbworks.com/w/file/fetch/144804627/cloud_gaming_apk_mod.pdfIn PDF document text
    • http://vawaguzidatu.pbworks.com/f/darirevowomazopa.pdfIn PDF document text
    • http://mutoteja.pbworks.com/w/file/fetch/144497208/gilixegeseb.pdfIn PDF document text
    • http://felefejimax.pbworks.com/f/metitulanokibumatewilul.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_off00011afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFE 4856 bytes
SHA-256: 7ed48b27cfe42c350d9cff91e8b6805ff0efd2e26746dfffa6ed01f2c1e90570
font_01_sfnt_off00012b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B82 10744 bytes
SHA-256: 507ca9335c2cc945a061c137c884f652e7bf588feab9f0f12176b07d5e466316

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