Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c2d72fccb55687…

MALICIOUS

PDF

67.7 KB Created: 2021-09-26 12:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5e0afa9238a6dccf10900aa08c5eaca SHA-1: 26267a5295a7bf1c28f7449eb3f8c49574ffc4db SHA-256: 09c2d72fccb55687b6274869fa77085f94575cc64696b2e4ccb5a87d29ab9ffc
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-only lure, a common tactic for phishing or malware delivery, as indicated by the 'PDF_IMAGE_LURE' heuristic. It contains numerous embedded URLs pointing to potentially malicious or disposable hosting sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://smidgel.ru/uplcv?utm_term=thop+tv+free+download+windows
    • https://alaskaproauto.net/nbloom/fckuploads/file/20720376595.pdf
    • http://tuvantindat.com/uploads/2021-09-17/images/files/79142493701.pdf
    • http://skiflogistics.ru/userfiles/file/8999291218.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16132d54db34cc---84004655810.pdf
    • http://parkingparts.com/Upfiles/file/35695977186.pdf
    • https://divetechmarine.com/contents/files/364432074.pdf
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/11311771937.pdf
    • http://abnig.friendship-match.com/upload/files/54628976903.pdf
    • https://chineseclothingonline.com/File/17712826523.pdf
    • http://gkz-crimea.ru/userfiles/file/84623772400.pdf
    • http://kehlux.lu/userfiles/files/butakagobogifo.pdf
    • http://telegid.tv/userfiles/file/32230750681.pdf
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/89753914676.pdf
    • http://bienchidan.org/uploads/files/wujip.pdf
    • https://eco-translation.ca/upload/editor/file/difabalupinonosij.pdf
    • https://zweefvlieg.net/userfiles/file/nimajewukagufejegodal.pdf
    • https://yuvasarkar.org/userfiles/file/39921818335.pdf
    • https://dongcohonda.com/userfiles/file/56544228915.pdf
    • http://drthchowdary.net/userfiles/file/tugol.pdf
    • http://kaies.net/upfiles/210916220903121598476hur.pdf
    • http://agapetown.net/ckfinder/userfiles/files/kamajutedefotavosegi.pdf
    • http://strap.sk/uploads/files/gagiwibuziwamapo.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_off0000ab8d.bin
7c3c945e186f4d055a01e947d2ded60610fb587d892edf6f56d36cdd54d3db29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB8D 10712 bytes
font_01_sfnt_off0000c423.bin
6e46339d07f845f69d6e9e058793bcb557c02417f635772d281a19d302b9502d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC423 14304 bytes
font_02_sfnt_off0000e7db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 16792 bytes

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