Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6c6e61c6f28fad…

MALICIOUS

PDF

80.6 KB Created: 2021-04-25 16:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7588b3113a436a7d5c298b528c541278 SHA-1: d1cb6c924109b3e6c28757ecf1e3523ee4d335fb SHA-256: 5f6c6e61c6f28faded82c5bb13e01d6ae7bcbcf6276d916755a40f1dc77592d9
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded links suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gimoguvi.ru/strik?utm_term=subway+artisan+flatbread+nutrition+info
    • https://jarofipe.weebly.com/uploads/1/3/1/4/131408229/vunanapa.pdf
    • https://dobuxodujunov.weebly.com/uploads/1/3/2/7/132741154/finimorun.pdf
    • https://negapisege.weebly.com/uploads/1/3/4/6/134635707/jebevezusixoj-jorafenigidomi.pdf
    • http://ruzamaji.getenjoyment.net/dupematugejowabiweripo.pdf
    • http://rujewazaxijaza.sportsontheweb.net/tawowurexilojolikebiw.pdf
    • http://kokulotasuz.mygamesonline.org/mapekuforiguwobamewotaben.pdf
    • http://tehnotop.site/mobilosepapi5c81u.pdf
    • http://crawlmqyu.space/49113227980w8l10.pdf
    • http://lnstagram-help-businesss.com/555618772209yvxd.pdf
    • http://lokubakodo.getenjoyment.net/structured_cabling_system.pdf
    • http://kosamaritaj.getenjoyment.net/weight_loss_diet_menu.pdf
    • https://wopopodixela.weebly.com/uploads/1/3/0/9/130969383/kuxap_fojug_zusuraluxo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gotitibekovi/describe_the_three_estates_of_french_society_before_the_revolution.pdf
    • https://uploads.strikinglycdn.com/files/1833f05d-0964-497d-8ef2-b086fd36a497/tuvubunosajemigexu.pdf
    • https://uploads.strikinglycdn.com/files/188c1aeb-e3c4-4a7d-a811-c4abd29c078b/why_is_my_washing_machine_not_taking_the_fabric_softener.pdf
    • https://uploads.strikinglycdn.com/files/fbe5174d-5fde-4a93-a6bb-f874fc301c80/automobile_mechanics_download.pdf
    • https://s3.amazonaws.com/jemisajoda/bluetooth_windows_7_microsoft.pdf
    • https://uploads.strikinglycdn.com/files/6fa14f5f-e53f-4b47-b2e0-923875b151c5/kolb_learning_style_inventory_questionnaire.pdf
    • https://s3.amazonaws.com/pirofopafu/jupigenijobikaka.pdf
    • https://uploads.strikinglycdn.com/files/53006133-0859-42a0-81a3-bf959808583a/41291846770.pdf
    • https://uploads.strikinglycdn.com/files/daf17118-6498-427b-8fe5-b59ab55fddaf/56243659605.pdf
    • https://s3.amazonaws.com/mujesogi/how_to_do_digital_watercolor_portraits.pdf
    • https://s3.amazonaws.com/fovezewi/76271049958.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbd1.bin
b7a1e4e2ab5104f25d6bdba774f0c83e9869ee0dda614a184b8cde070538ae43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD1 5336 bytes
font_01_sfnt_off00010e1a.bin
29156d9991446be75fdd011fdb49118032646b94008f5728d9208fe0b69cbb12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1A 11480 bytes

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