Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d6614382d7eac5…

MALICIOUS

PDF

85.4 KB Created: 2021-09-16 21:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58f4b399d13ea077d014ed493ad41d8e SHA-1: 638a2c037333a47b5234367c1ec77e3e0380b2cb SHA-256: b4d6614382d7eac59313599ef0a9840c3dc1830edaa01aaf68416ad5f085a356
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the ultimate destination. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://abwclayton.com/uploads/files/pezuvubupepumanok.pdf
    • http://0vote.com/ckfinder/files/zugasoso.pdf
    • http://cs-golfclub.com/ckupload/files/52563817942.pdf
    • http://kmjmt.com/news/upload/file/210914000840980970b0i17e.pdf
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/wufik.pdf
    • https://implantsdentairesdesmoulins.com/upload/editor/file/zodugigolezaroturiwogiwop.pdf
    • http://montoaneli.com/ckfinder/files/23507017817.pdf
    • https://vinadesigndanang.vn/uploads/image/files/54527644361.pdf
    • http://gonvvama.net/filespath/files/20210910010003.pdf
    • https://dichocungtoi.com/userfiles/file/lizadimebogugopokusu.pdf
    • http://sasolution.kr/userfiles/file/49197175020.pdf
    • http://greenvisioninternational.gm/userfiles/file/mibaw.pdf
    • http://ihdbd.org/upload/files/rimubapikebitukox.pdf
    • http://friulanamarmi.it/images/file/63311096463.pdf
    • https://tatsolarlight.com/uploads/files/tasad.pdf
    • https://inprovitchile.com/ckfinder/userfiles/files/vipulewosasofezin.pdf
    • https://www.confirmedtour.com/files/xusuz.pdf
    • http://solarexperten.ch/fckeditor/editor/images/file/weronivegudaxojukaxuvu.pdf
    • http://techcessgroups.com/userfiles/file/koxizuwabenokudiz.pdf
    • http://minhledtran.com/luutru/files/wotamuguvabatekasot.pdf
    • https://liur-krd.ru/userfiles/file/viziludelotiduridon.pdf
    • https://magicdiscoradio.com/userfiles/file/48625162360.pdf
    • http://longruiglass.com/ckfinder/userfiles/files/20210901_090519.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=save+apps+on+sd+card+android
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfbb.bin
d07a1d947213a27588bbe1e3fba13fb5927b4c88fce40ad4c1a76c82b47ba825		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBB 17032 bytes
font_01_sfnt_off0000fb84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB84 16792 bytes
font_02_sfnt_off00011395.bin
f9a2b9f1429043b06036762fbe4059edb1687e97491b6788d98b2fa363fb0a6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11395 18080 bytes
font_03_sfnt_off00012f6b.bin
c439e91cba81ddfec9697e8e89b2f526dab2324f58ee014c89cdba5ea5ceb021		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6B 10504 bytes

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