Malicious PDF — malware analysis report

Static analysis result for SHA-256 80bce3cb00e6c7a6…

MALICIOUS

PDF

110.4 KB Created: 2021-03-27 21:37:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ae7f8af6877d5b4126580726f8c6fa2 SHA-1: 7445712ea6cd053ed5d8976ac750bd926a4021f3 SHA-256: 80bce3cb00e6c7a6e08152797a0d06df0333271d3ca97979fba3cb3d8faff718
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of an SEO spam or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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-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://kuzutuzo.ru/aws?utm_term=que+significa+cada+parte+del+escudo+de+costa+rica
    • http://blacktea.space/79645724042w02ev.pdf
    • https://gagufivelorifig.weebly.com/uploads/1/3/4/5/134596616/wamutogok.pdf
    • http://indonesia2health.online/whats_the_point_of_urea_recyclingl7lhr.pdf
    • http://wilozobugo.iblogger.org/dazamefurefo.pdf
    • https://seruvexude.weebly.com/uploads/1/3/4/4/134404645/0aa23174f9.pdf
    • https://vimavopama.weebly.com/uploads/1/3/4/7/134769365/kizudumejofenal-xewutebokuwujos-zulojaxenitivi.pdf
    • https://ludolukek.weebly.com/uploads/1/3/4/6/134699908/wanudowed.pdf
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/zogudogixe.pdf
    • http://sorekivobu.22web.org/78849233307.pdf
    • http://parhelifrl.space/zakabitn6p0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://48e5b1ff-25fb-49a4-826b-3ad3f3a15688.filesusr.com/ugd/0d632a_8fe148e54dbe4fab949e44f00a325d23.pdf?index=true
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_1a039e5c1f7f4668abafb633a0e71799.pdf?index=true
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_49b23c6b927f4596b0a3c714f079f16c.pdf?index=true
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_fd327110dd6f45179dcb283b98b5a2ea.pdf?index=true
    • https://s3.amazonaws.com/wikurixobelu/marvel_heroes_mac.pdf
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_b302f7bf469d494da5bcf3480ea6ac54.pdf?index=true
    • http://pekoguwomigurup.epizy.com/34225366925.pdf
    • http://fosisoxefet.epizy.com/bosques_tropicales.pdf
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_e65ccba2588347e5893034030f748661.pdf?index=true
    • https://s3.amazonaws.com/bededuxotulapil/90824040417.pdf
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_f99c06627f3d442c921a999cee37ae87.pdf?index=true
    • https://3df06c22-1e8a-4082-8cc2-a0fdc0609706.filesusr.com/ugd/d86e81_137ae6985ea94b479bb77e438e9638a7.pdf?index=true
    • https://s3.amazonaws.com/muxozuvalubi/centre_de_formation_cesame_vinci.pdf
    • https://36d3fe4d-ce77-4ecd-ae21-04b42370c250.filesusr.com/ugd/871c54_2358159596d141a2967dc4b771d942ca.pdf?index=true
    • 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_off00016b87.bin
4cb3633368c1d325ce67313d487a034391733ba3d7b0ee887ff079415a48ad06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16B87 5384 bytes
font_01_sfnt_off00017deb.bin
f0d08efbff86cc6bfdd6b19db91c9ba96a9e36eeacb38869d07e6833f66d6cdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17DEB 14344 bytes

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