Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd17e7f47bf125a6…

MALICIOUS

PDF

70.8 KB Created: 2021-09-23 21:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1b9837db7807d4cae29c091f611dd27b SHA-1: 9c74380db45741a437b2cc0a91d8aa6067d678a5 SHA-256: bd17e7f47bf125a646cebd1a2a241ab828120024b2c44d15920176bddd6ec497
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to function as a link farm. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests an attempt to redirect users to potentially harmful content. While no scripts were directly extracted, the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 4

  • 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://crewmak.ru/uplcv?utm_term=iphone+1+pro+max+price+in+bangladesh PDF link annotation
    • http://gysanya.com/upload/file/210913130635620498xc3ama6ir73d.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/vurisop.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/86608921910.pdfIn PDF document text
    • http://cissi.it/userfiles/files/bawafeki.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/22309490005.pdfIn PDF document text
    • http://philboyd.com/losatozesamizalagewib.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/46857481054.pdfIn PDF document text
    • https://aksusu.com/upload/files/51022084883.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/20020466913.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/70113777064.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/xemifadalawopikad.pdfIn PDF document text
    • http://fxmeat.com/upload/file/ce3368573d0d47d67918450fc47bc7f8.pdfIn PDF document text
    • http://bushurov.ru/images/files/27606432488.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/6834005920.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/49039682342.pdfIn PDF document text
    • http://rafaelokazakov.com/file/peguwokexipisadujoluz.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/76212250064.pdfIn PDF document text
    • https://ksuskalology.com/images/file/sadoridofaxapowonaj.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/pafopan.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/19638468048.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/19014729405.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090502070189.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109121859179471.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/74934459415.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB334 11108 bytes
SHA-256: bd34d4632e54a64392716ea0778b5a253391118140495ef2edb70efceadb25cf
font_01_sfnt_off0000cc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE495 15892 bytes
SHA-256: 135904c918e9b788c062780637448efe4341c6639a8e391f30528b26ae168698

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