Malicious PDF — malware analysis report

Static analysis result for SHA-256 abfb5cee13cb78c1…

MALICIOUS

PDF

102.3 KB Created: 2021-06-02 04:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1cdd85f5a68d3806b1bee897adcd2be SHA-1: 5723b5a2d6cd5f65a33788715fc91a43b47c4871 SHA-256: abfb5cee13cb78c1915e23ec10d3fbf51a539e0dfce9e8f1c6c6081b17e05213
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL, 'https://nomylo.ru/pbw?utm_term=why+the+catcher+in+the+rye+was+banned', is likely used for phishing or malware distribution. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The document body is heavily obfuscated and unreadable, but the presence of numerous links and the ML classifier output strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/pbw?utm_term=why+the+catcher+in+the+rye+was+banned
    • https://static.s123-cdn-static-d.com/uploads/4487903/normal_60b6ada4b2b3f.pdf
    • https://jejuzuvavat.weebly.com/uploads/1/3/5/3/135384919/7528852.pdf
    • https://static.s123-cdn-static.com/uploads/4414360/normal_60068dde95a5d.pdf
    • https://tetavezodumop.weebly.com/uploads/1/3/4/6/134645623/pixurusutuzoro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kivupored.pbworks.com/f/nice_guys_movie_trailer.pdf
    • https://uploads.strikinglycdn.com/files/1c9eafa8-aaba-496a-8588-ebc80e085f0c/econ_alive_study_guide_answers.pdf
    • https://uploads.strikinglycdn.com/files/fecd3990-7de8-4234-bcd6-9573c971236e/62482406173.pdf
    • http://jajafad.pbworks.com/f/mobile_app_development_interview_questions_and_answers.pdf
    • http://betosaxugawi.pbworks.com/w/file/fetch/144467418/tumofef.pdf
    • http://kokoxudalux.pbworks.com/f/printable_color_pages_for_kindergarten.pdf
    • https://uploads.strikinglycdn.com/files/070b1221-a792-4a95-b7cc-d664d57be8ad/balujafakinizide.pdf
    • http://mogulazedub.pbworks.com/w/file/fetch/144483672/buxobum.pdf
    • http://nunaruribeg.pbworks.com/f/1394092987.pdf
    • https://uploads.strikinglycdn.com/files/97cb7bc5-aea0-4bb1-9313-94962437135f/sentry_safe_customer_service_email_address.pdf
    • http://risuxujuvu.pbworks.com/w/file/fetch/144482835/kanov.pdf
    • http://kufujibumufa.pbworks.com/f/jandy_pool_heater_owners_manual.pdf
    • https://uploads.strikinglycdn.com/files/cc00956a-634a-4984-b1da-e7e4fb094c78/whats_the_difference_between_beretta_92f_and_92fs.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_off00015504.bin
cca95fdad72fee1285af22655c371cb947a504619013b453e797088527881809		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15504 5340 bytes
font_01_sfnt_off00016744.bin
ed1dc6d35ae02c8b6c3ae99bb440fe0fe171477b171fd6c6a590399fe7568f58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16744 10452 bytes

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