Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ecde82ee5af3efb…

MALICIOUS

PDF

74.9 KB Created: 2021-09-22 13:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 396146c38e8a57e3c25f27a2211b7abc SHA-1: a5cddcd75bd56a029b19588356c12f3b5bad01c6 SHA-256: 1ecde82ee5af3efbb68a1b2ab3c845202625e8c6f4ff79a532da8bd543664b03
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm on disposable hosting, with numerous links pointing to PDF files, suggesting a phishing or malware distribution scheme. The presence of multiple unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://fge-service.com/userfiles/file/99755831778.pdf
    • http://feynburg-uhren.de/uploads/2774924151.pdf
    • http://xhiehchin.com/Xhieh_News/_file/kosivabitinademadef.pdf
    • http://banhangcongnghe.com/upload/FCK/file/25019049808.pdf
    • https://mkontakt.com/dat/file/xojupevadaxolabagomuj.pdf
    • http://primebrokeragetx.com/ckfinder/userfiles/files/90179745177.pdf
    • http://autoscuolauniversale.it/userfiles/files/71213610886.pdf
    • https://soportedevida.mx/ckfinder/userfiles/files/dojetinegade.pdf
    • http://goodlife88.com/uploads/files/kotawonojisugi.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/4gaitpl4jliglcp6pml4csk6k2/wazuwegerimajuxajedeliz.pdf
    • https://ganganagardentist.com/userfiles/file/revifonowe.pdf
    • http://southerncross-ex.com/images/blog/file/19709109308.pdf
    • http://christschoolblr.in/userfiles/file/vemilugugorake.pdf
    • https://infotechloyalty.com/bot/ckfinder/uf/files/bixezivuwavinoraduwujafo.pdf
    • https://nichecnk.leaddeehub.com/userfiles/files/ditagewu.pdf
    • http://advairtech.eu/assets/userfiles/file/13090190095.pdf
    • http://coomargroup.com/ckfinder/userfiles/files/neloze.pdf
    • http://istanbulballoons.com/ckfinder/userfiles/files/47563673363.pdf
    • http://wirheiraten.de/images/file/mutagimobovuwu.pdf
    • https://cheeselicious.net/UserFiles/file/12332804177.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=download+latest+version+of+tubemate+android+app
    • 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_off0000c0dc.bin
4c734edc8199f6267da1cd35b9d98d9f1c4df153081c6f612487932ae7c250ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DC 11052 bytes
font_01_sfnt_off0000da6d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 16792 bytes
font_02_sfnt_off0000f27f.bin
221e13ef452b12022ccbb7cd1be35b4ef8dc85c3c26807dcbcf09eb2d0839fc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 17040 bytes

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