Malicious PDF — malware analysis report

Static analysis result for SHA-256 d936fa758282a206…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 21:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3767a3ba0a0f3a1394702e0959afec5b SHA-1: aba178e6c90c71920549092835ff91cef2f52c22 SHA-256: d936fa758282a206925f1a15711546a91cf9dd7e0b9e4459f2d9b18b3411cd54
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains, and is identified as a link farm. This suggests the primary purpose is to redirect users to other malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://tcyy88.com/userfiles/file/2021090300521573499.pdf
    • http://stigstudiotecnico.it/userfiles/files/88705025978.pdf
    • https://aznamaste.com/ckfinder/userfiles/files/gedaje.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134268ac0d2d.pdf
    • http://savemaxint.com/files/file/fipivigoxosegodi.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/toluxafejuxoxu.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16136fa41b5d6f---12651315439.pdf
    • https://consultemergingmarkets.cubsindia.com/files/78859167279.pdf
    • https://ww150005.linebot.net/upfile/files/20210905063213.pdf
    • https://texasbordervolunteers.org/userfiles/file/13928141559.pdf
    • http://sungsam.net/userData/board/file/75590051341.pdf
    • http://tfe-design.dk/userfiles/file/kawavupebukowizumiludekon.pdf
    • https://megacook.pt/site/upload/file/datorokenujebi.pdf
    • http://cuspsurgeons.com/userfiles/file/65017725467.pdf
    • https://tskrea.com/userfiles/file/wusimiduxufulijezu.pdf
    • http://dietetyka-24.pl/images/files/gikadoruwotimowigileb.pdf
    • http://compsult.net/userfiles/file/fexunibuzinigebaz.pdf
    • https://sieuthimaytinhcu.vn/upload/files/88192276457.pdf
    • http://gleb777.com/fck_upload/file/67220785913.pdf
    • http://dydlhx.com/upfiles/file///figezolobodone.pdf
    • https://insp.biz/img/file/dudabinirelu.pdf
    • https://fasleh.net/Files/files/55692184686.pdf
    • http://tivati.com/uploads/userfiles/file/vevefeniwasi.pdf
    • http://baldonimarcostudio.eu/userfiles/files/vategab.pdf
    • https://nutricount.cz/UserFiles/File/20259994889.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=german+numbers+1-100+pdf
    • http://pro.ovh.net/~tribuene/images/banque/file/75663318263.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_off0000db6f.bin
0b4efb2613cea5cfde2da493fb0fe64112941b96d5a37de361f0c329adb38fe1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 10788 bytes
font_01_sfnt_off0000f41e.bin
55d459b9c69db6f0724e93eaf62aaa689b039f188712dc13bdae984221d4f4d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 18852 bytes
font_02_sfnt_off0001245a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1245A 16792 bytes

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