Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27a46149fe8b08f…

MALICIOUS

PDF

79.2 KB Created: 2021-06-13 20:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8faa0d18f9de23af18e4abc9561784c6 SHA-1: 042c8cacb064f10308dbe4067be5cbccb934bfa8 SHA-256: a27a46149fe8b08fbf45570228f04a83e9a506dd710bc7aa7cc9be3edd96282d
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary URL, 'https://vilenefex.ru/123?utm_term=effective+communication+skills+activities+pdf', is likely part of this scheme to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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
  • 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://vilenefex.ru/123?utm_term=effective+communication+skills+activities+pdf PDF link annotation
    • https://sabigojepesadiz.weebly.com/uploads/1/3/2/8/132814096/7380256.pdfIn PDF document text
    • https://vawisopikev.weebly.com/uploads/1/3/2/7/132740649/86e4936968.pdfIn PDF document text
    • https://nitowapesapu.weebly.com/uploads/1/3/4/4/134442046/8049714.pdfIn PDF document text
    • https://sikukaposarimi.weebly.com/uploads/1/3/5/3/135307882/d2ffc9712e.pdfIn PDF document text
    • https://xogotosab.weebly.com/uploads/1/3/4/3/134327909/4ec5a.pdfIn PDF document text
    • https://tegimawemax.weebly.com/uploads/1/3/1/3/131383609/3582660.pdfIn PDF document text
    • https://lemorixumo.weebly.com/uploads/1/3/4/7/134748879/dccd089846.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
    • https://uploads.strikinglycdn.com/files/cb0074e7-fac0-480a-b731-17031b113f56/buzesovivinogubivipazomi.pdfIn PDF document text
    • http://jidizan.pbworks.com/w/file/fetch/144886470/pukunewamoxikiroturovime.pdfIn PDF document text
    • http://xupatamim.pbworks.com/f/kabhi_kabhie_1976_movie_free_download_720p_bluray.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dffa9d9-0149-4f9f-a100-a36aec1b4b4f/hamilton_beach_steamer_rice_cooker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f72ced45-5db1-4dfd-8b8b-35d29234b0ee/95856217343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8f402b3-4af1-4edc-a5b7-7f13f94a31a6/72119815268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b6a7fae-1b8e-4d7a-b667-c33c3b8e7840/93297189987.pdfIn PDF document text
    • http://doxawadar.pbworks.com/w/file/fetch/144792552/guvuzarani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/741aa40f-b622-407d-9863-6edc178aec8b/38405077953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/693ba338-8bc2-4d77-8fdc-d41fd43763a4/boxow.pdfIn PDF document text
    • http://gopamubozi.pbworks.com/f/kanukula_nikira_kadhaliye_song_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/193f3634-ce4f-4fb7-9dd7-4a7d54e14e4a/can_you_play_the_game_of_life_on_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4d8d30f-12d5-4434-bcb4-2124652c4de5/gowujezalojajubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c81b1d92-b419-44c7-bb14-23e10c3ad30e/19113841545.pdfIn PDF document text
    • http://wiliser.pbworks.com/w/file/fetch/144464457/what_zodiac_sign_matches_well_with_cancer.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_off0000eb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB11 5168 bytes
SHA-256: 5c0d220a3172ec8b99580749e04f8c7a14f0358d5e494b810f2266eed2c95daf
font_01_sfnt_off0000fca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA0 10172 bytes
SHA-256: 679346dc37c158206aa6fc5419bb1c20c1296233c047146f17983c3cab85b78d
font_02_sfnt_off00011f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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