Malicious PDF — malware analysis report

Static analysis result for SHA-256 e274e9767affea4c…

MALICIOUS

PDF

70.7 KB Created: 2021-10-08 21:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3f372332d5a3c95915b09da26ecd0f5f SHA-1: 1587fec162a1cfd6c379ad2d8af6731e678eedf0 SHA-256: e274e9767affea4cf4c70515ef6d03f0d3b19488a0f6ec4c5176a34b9346d502
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://queure.ru/uplcv?utm_term=quotes+about+being+laughed+at PDF link annotation
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/99430939571.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/mileluganij.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/90906464586.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615f2592b0337---33032757131.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/36470677986.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/14626111189.pdfIn PDF document text
    • http://partnercable.com/files/tuperelowoganepedijifeji.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/79560568505.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/towedegurivik.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/puropegipokorepofa.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/7534789291.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/xabakezanosa.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1632333597.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/99666192810.pdfIn PDF document text
    • http://jonme.net/ckupload/files/jolusudelufa.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/58741405870.pdfIn PDF document text
    • http://ecole.ru/text/images/file/58557749924.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/62603419715.pdfIn PDF document text
    • https://halkum.rs/files/bavazexujimevobezoxigov.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/16111958864.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/fezalejup.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9C 10728 bytes
SHA-256: 88864ac6d6490c15af922abc811e92a856053430f8734e5ec0bba76baf9d54ae
font_02_sfnt_off0000e60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60B 15428 bytes
SHA-256: aaae2232713328393a8b1a053b495796a47fd0f98e509833e109dd3cdd8dcb48

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