Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce65e9a136bb486…

MALICIOUS

PDF

84.9 KB Created: 2021-09-18 13:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd0cb7ec0ca762435d3465279d6e5c81 SHA-1: 9c268bbe25a1de30896b2013f56ed128e54af44e SHA-256: 3ce65e9a136bb4861b0d63ef5b6e7820fd0dbbafa3a231d6d3a3a018a385fd02
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it is a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of embedded URLs and the 'SE_CALLBACK_LURE' heuristic strongly suggest a phishing attempt, likely to trick users into calling a fraudulent number. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://aapltd.net/userfiles/file/46246994218.pdf
    • https://tavcam.com/upload/ckfinder/files/lewum.pdf
    • http://lev-steklo.ru/userfiles/file/17096261771.pdf
    • http://www.euro-fly.eu/userfiles/files/lebima.pdf
    • https://bnbcostaverde.it/userfiles/file/xekametigopebokexupuvatib.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fe98b9883---58044237642.pdf
    • http://aqcorth.specialty-match.com/upload/files/xipuvutanedeniwolofivubo.pdf
    • http://lauraestetica.com/userfiles/files/wefamonoreduku.pdf
    • http://ingore.cn/upload/files/11655340260.pdf
    • https://vaynhanh365.net/contents/files/48789011311.pdf
    • http://thechitay.com/uploads/userfiles/file/71830418857.pdf
    • http://elijasprojekts.lv/files/file/48681982913.pdf
    • https://mimpishio2bet.net/contents/files/fibarut.pdf
    • http://samafb.org/uploadfilefiles/bavak.pdf
    • http://roosprommenschenckelfoundation.nl/userfiles/file/13590755670.pdf
    • http://hongphuc.vn/userfiles/file/siliwam.pdf
    • http://michardardillier.com/ckfinder/userfiles/files/kowixinilowaf.pdf
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/5323869985.pdf
    • http://doo-san.com/userfiles/file/20210910042922.pdf
    • http://turskazka.ru/ckfinder/userfiles/files/xotodumodevus.pdf
    • https://ltes.tw-goods.com/UserFiles/files/71256484832.pdf
    • http://impactpluslearning.com/ckfinder/userfiles/files/89394522426.pdf
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/tiwituruf.pdf
    • http://snap-drone.com/userfiles/file/goxasaromuveselusekifo.pdf
    • http://abwingsbuffalo.com/uploads/files/xefazitibapagodiwipukosir.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=7th+edition+apa+website
    • 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_off0000e536.bin
42371a205fde81d4c2eafb1111cbcb8d1c83edddc2bb048aced4f0839a834b0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE536 18760 bytes
font_01_sfnt_off000115f0.bin
5f6ec7a0bb8cc24d1e22dc247285d9a0ec053f1e18431943872ba641be082e01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 10520 bytes
font_02_sfnt_off00012db6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB6 16792 bytes

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