Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa505f701a07c32…

MALICIOUS

PDF

77.6 KB Created: 2021-09-13 01:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab9c7575d2bfeff71a2652113fc20c2b SHA-1: d479bc19b030a0ca7712d16dd5b7c9ff471a84e1 SHA-256: 7fa505f701a07c3210e1dcdc8bdb93694a94d7675942c9dcae96577043f8726b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which host PDF files. The presence of embedded URLs and the overall structure suggest an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://petribax.nl/userfiles/file/51452911123.pdf
    • https://questyme.ca/userfiles/file/miluti.pdf
    • http://rinsacars.com/files/others/vepomozi.pdf
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/28086160471.pdf
    • http://elitk.ru/_files/90954737665.pdf
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/mojixugivu.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/efe848b0647902cfaaaac40784004bd7/99678507327.pdf
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/jujedomuju.pdf
    • http://reanda.com/jingkelun/userfiles/files/20210912125108.pdf
    • https://holcom-wd.com/webroot/img/files/13231671742.pdf
    • https://baxsporthorses.com/userfiles/file/turoxanujolarirekawuke.pdf
    • https://artedelvalle.cl/gal/files/file/kexorinujetagowigetisez.pdf
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/79876227477.pdf
    • http://slovoveri.org/userfiles/rokugererosujubumalow.pdf
    • http://greenearthgardens.org/userfiles/69396784347.pdf
    • https://reklama71.ru/upload_picture/rufowiwojon.pdf
    • https://portalbime.com/UploadedFiles/New/file/78753022416.pdf
    • http://xinyaoqiye.com/upload_fck/file/2021-9-9/20210909231406399820.pdf
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/bitikaf.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc3166d235---2906924358.pdf
    • https://evrenmentese.com/upload/ckfinder/files/5494204768.pdf
    • https://thehouseconcert.com/ckfinder/userfiles/files/7931611167.pdf
    • http://skncn.com/u/files/dotaxariso.pdf
    • http://myepres.com/HotelEstimator/userfiles/file/fubobaku.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/90549958464.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=one+week+friends+watch+online
    • 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_off0000ca4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4B 16792 bytes
font_01_sfnt_off0000e25d.bin
001332bd587e36c7326cff2cd5a7aa0e5a1f49ddfde4d43724caa7f9d6c431b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE25D 17732 bytes
font_02_sfnt_off00011014.bin
669e2600eee5800cfa103337b70a789072b2cef531a234d5db6b6e34476e4a82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11014 10776 bytes

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