Malicious PDF — malware analysis report

Static analysis result for SHA-256 8161ed010b17256a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 18:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb833b63f6581d2fb09011765b7e7f65 SHA-1: bfcedf698a96f3136c541cf172e5e87f8936965d SHA-256: 8161ed010b17256a8374127d19de46d12987e117d5a993bd045bf0f83ae80daa
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huyminhplastic.com/upload/files/70940943836.pdf
    • http://turagent007.ru/userfiles/file/49735234661.pdf
    • http://tobn56.com/UpFiles/file/susoxivufet.pdf
    • http://synerfreight.com/syner_upload/images/files/41976509942.pdf
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/kibimu.pdf
    • http://cu-hinothai.com/ckfinder/userfiles/files/guvotewevunazedejuxinigor.pdf
    • http://moriefrusca.com/userfiles/files/35632311842.pdf
    • https://leosservices.com/userfiles/file/ximuwikulejesap.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/76456969945.pdf
    • http://safires.cz/ckfinder/userfiles/files/47164845040.pdf
    • http://papierplus.pl/userfiles/file/74759129759.pdf
    • http://www.deco-interieure.com/userfiles/file/54148481873.pdf
    • http://hwayoung.kr/upfile/files/nivopolojo.pdf
    • https://norservis.com/files/files/34894366930.pdf
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/jutono.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d80e8bd74---lozugeguv.pdf
    • http://vivaibonomo.it/userfiles/files/34994732920.pdf
    • https://keongracun.org/contents/files/13191640601.pdf
    • https://barrierball.cl/ckfinder/userfiles/files/57427291702.pdf
    • http://fujavietnam.com/images/Download/43778932848.pdf
    • http://herborgthailand.com/file_media/file_image/file/nutetu.pdf
    • http://duplisite.com/userfiles/file/gizavusopevudiwo.pdf
    • http://hilimall.ae/uploads/files/lasuxi.pdf
    • http://huh.hu/UserFiles/File/fasososutenunanu.pdf
    • http://riggi.ru/userfiles/file/82628832298.pdf
    • https://svltv.in/userfiles/files/27171019043.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=android+developer+record+screen
    • 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_off0000d78d.bin
845fa421c282117eca67d4c8498a0b0585c4374db924a4a2f7a1db940a5f1de5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD78D 10296 bytes
font_01_sfnt_off0000eecb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEECB 16792 bytes
font_02_sfnt_off000106dd.bin
2859fa187e4eedb74e5a95200955999be81b0d9dd0209d7084edecdb7d88f593		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106DD 18100 bytes

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