Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8763ebb61b132d7…

MALICIOUS

PDF

90.2 KB Created: 2021-03-28 00:46:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ac3613241179971c03f26cb345d0c1c2 SHA-1: 8dc731d0ed7b68a7044c1c7170337568db6ef165 SHA-256: d8763ebb61b132d706dac9191dd682d63e82390f931cf6bf5621c9e887f0ccd3
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm and potentially malicious. It contains numerous external links, with one pointing to 'baarspo.ru', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8052

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • 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://baarspo.ru/award?keyword=kruger+axial+fan+catalogue+pdf PDF link annotation
    • http://fajesamosini.sportsontheweb.net/aisthesis_jacques_ranciere.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/focusrite_scarlett_solo_ableton_live_lite.pdfIn PDF document text
    • http://nidewopovuwubo.mypressonline.com/how_to_fix_a_bathroom_faucet_leaking_at_the_base.pdfIn PDF document text
    • http://esagafow.fun/tedemorotigojejijiguanauw.pdfIn PDF document text
    • http://kurs1.xyz/dajukirozakawinozuh2kkp.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/redegelesibif/icaiexam._icai._org_admit_card.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/k_v_y_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/akhiyan_janab_diyan_mp4.pdfIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_a3258925d9d745acaf587d8616c24948.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f312129-7446-455a-a7a6-a7d05934c1a5/letavuwitabirifimokesutep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e0608e6-0186-4ae3-963a-0cfd6c205e12/16624706478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/affd8d8c-79d5-4d82-9cba-d0b15eb5f940/93017114631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81df8dc2-90c8-447c-b604-173b98507f62/how_to_reset_toner_counter_on_brother_hl-l2360dw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe1ace59-bd26-40b9-a253-1356f704d970/47587128623.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/52856285356.pdfIn PDF document text
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_ae6c9f2479764b17b016e1bbaf214229.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/23aeae99-bfa2-4880-8f63-994ded00d260/xivujofasebukonebules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73289a1c-cf74-4a46-84a2-b5edd1f7af8a/gender_ideas_interactions_institutions_chapter_8_summary.pdfIn 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_off00012ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE5 5180 bytes
SHA-256: 75a5b548cc6c115443e5e799276e98c9105a1f5dc11106065965393da458c8b0
font_01_sfnt_off000140a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A7 13228 bytes
SHA-256: 03253ce769b104e657ae94dbdf6bc6acc34c677cd3281754d156078b4b41b91e

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