Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba42415fffd05b3…

MALICIOUS

PDF

72.1 KB Created: 2021-06-12 02:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4a9d722d613cc075d2436f1ed310ce69 SHA-1: 80b320c8566a12254d9c86ccd18c2a2c7cb5a463 SHA-256: cba42415fffd05b378f1394e9741e5b3b2789b6c1c8ee0810f372527bf592196
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cructi.ru/pbw?utm_term=zelda+snes+rom+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414847/normal_6061269721dc5.pdfIn PDF document text
    • https://gozanesudobewer.weebly.com/uploads/1/3/4/8/134852120/piger-kikam-nanafigev-vawikokud.pdfIn PDF document text
    • https://lufugidot.weebly.com/uploads/1/3/4/8/134848642/gavasur_ziwoforex_luvodiwumerik_begereri.pdfIn PDF document text
    • https://xuzelakojit.weebly.com/uploads/1/3/4/5/134593048/8447604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407795/normal_60c3e6a832f24.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad467a8b-2645-42f1-aa22-984c3e074685/zandile_the_resolute_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eff07b61-c383-4b5a-901c-c8f52401f6c1/60307345217.pdfIn PDF document text
    • http://wiwudoje.pbworks.com/w/file/fetch/144597714/89174853187.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/f/sufava.pdfIn PDF document text
    • http://wexagiz.pbworks.com/w/file/fetch/144786570/levy_county_florida_arrests.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/666dc437-9bae-4132-934b-c59895d7785a/sword_art_online_manga_ending.pdfIn PDF document text
    • http://rumusapage.pbworks.com/f/telegram_english_tv_series.pdfIn PDF document text
    • http://nojewalikar.pbworks.com/w/file/fetch/144833346/88661319793.pdfIn PDF document text
    • http://togusan.pbworks.com/w/file/fetch/144427554/vamawukomejuzir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9925c6d3-c30d-4de5-a4f8-83db9dc2c717/amino_acids_do_not_contain_nitrogen.pdfIn PDF document text
    • http://tovovojufa.pbworks.com/w/file/fetch/144669378/learn_english_grammar_in_marathi_language_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce563997-ac04-49d7-b6a2-9efb969fe8eb/2413460917.pdfIn PDF document text
    • http://tejuzedipebu.pbworks.com/w/file/fetch/145160214/car_parking_multiplayer_2.pdfIn PDF document text
    • http://xiwitanul.pbworks.com/f/98627900349.pdfIn PDF document text
    • http://lamedivu.pbworks.com/f/xivutijuraba.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_off0000e65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65F 5020 bytes
SHA-256: ce79101fbea529078805a42c1c6ff9dcde82374781f771beba99b3b3e1dfd314
font_01_sfnt_off0000f767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF767 10320 bytes
SHA-256: d73e68bcf7663473efeb33fb9934b00d67c7d8448aa870e4e28eba041e5a3b61

Open this report in the interactive analyzer, or submit your own file for analysis.