Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d270a5811c6579b…

MALICIOUS

PDF

69.6 KB Created: 2021-09-30 19:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40a1cf7a277071a7ba415ea91d03e386 SHA-1: 312b251be7af0305ad4df455fa83eaba7aca7af6 SHA-256: 0d270a5811c6579b6f86b5360ab7989dc582ee66e0d965fbef6992916bc2c87e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous URLs were extracted, many of which are embedded within the PDF and appear to be part of a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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://cructi.ru/uplcv?utm_term=android+1+into+the+dead+2
    • http://dokumsuzgec.com/userfiles/files/54212115941.pdf
    • https://nasikampung.info/contents/files/78812923066.pdf
    • http://linker-apps.com/files/90739884673.pdf
    • http://seowonbattery.com/files/fckeditor/file/916298028614922d44b3d6.pdf
    • https://qkon.ca/images/file/somokafujamopesetog.pdf
    • http://toanlinh.vn/upload/files/57926118841.pdf
    • http://gzcil.com/uploadfile/files/22347540521.pdf
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/91498090129.pdf
    • http://snft.ro/media/file/ragoxozinuri.pdf
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/govazipudilox.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/dedesabevefazojital.pdf
    • https://beaszemin.com/files/611347324.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/xejulavutoluzuduvixuw.pdf
    • https://datajournonepal.org/files/48843440534.pdf
    • https://festival.bg/fckeditorfiles/file/61642711401.pdf
    • https://fotojursa.cz/userfiles/file/95758221771.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/jo1hv3qnt4m9j3r5gst8rra0l6/93354736275.pdf
    • http://ettorebelfioreliutaio.it/userfiles/files/65248596850.pdf
    • http://coomargroup.com/ckfinder/userfiles/files/65443646936.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b92027f9b0---rilegava.pdf
    • https://nazrabilisim.com/calisma2/files/uploads/48973323890.pdf
    • http://zerosquareonline.com/file/26802854368.pdf
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/fewixuvulagaj.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b09e.bin
42ce208d39dfa3edc1a43a25f6b9ab444f4b251c9112ae6cdfad2c6de2c0a65e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB09E 10284 bytes
font_01_sfnt_off0000c7c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C9 16792 bytes
font_02_sfnt_off0000dfdb.bin
ed12a0589f06b2493ed04173126bc83fab4cf2635e613ff2f88a14ca14c71a11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 15692 bytes

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