Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ab2b0b7aee5fa6…

MALICIOUS

PDF

77.5 KB Created: 2021-09-09 19:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf91a53432dad2f3d8df8293fdd8262f SHA-1: d8e1443cdf68f863864fde732106263f58127834 SHA-256: c4ab2b0b7aee5fa666fadc37bb31070d37c93c0450acb601d9400596bdad7ed5
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 external URIs, with one specifically pointing to a URL containing 'utm_term=avatarify+al+face+animator', suggesting a lure for users interested in such software. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of hosting numerous links on disposable domains, common in phishing campaigns. No scripts were extracted, but the presence of external links implies the PDF is likely a delivery mechanism for malicious content hosted elsewhere.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=avatarify+al+face+animator
    • http://garderoba.sk/images/_file/kutap.pdf
    • http://urgentcarepb.com/userfiles/file/nuxixutuzavutajesup.pdf
    • http://ticaproduce.com/ckfinder/userfiles/files/90739548729.pdf
    • http://agt.es/files/galeria2/files/59317302139.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134a088cfd0a---7947392563.pdf
    • http://phutungototuanphat.com/img-tvdl/files/mivoromozivirowovanafeba.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecfd97d58d---62719000546.pdf
    • http://tpdw.pl/userfiles/file/23304683017.pdf
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28295641595.pdf
    • https://mallarpurnaisuva.org/go/file/4279754083.pdf
    • http://lasantitosrestaurant.com/userfiles/file/gasojupixalewexijijun.pdf
    • http://kubkao-kubpla.com/userfiles/files/sofewubigo.pdf
    • http://all-premium.com/user_file/files/sajav.pdf
    • http://konberdbio.com/upload/files/87466941064.pdf
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/fazovixixidotidaruvu.pdf
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/tixarutonisis.pdf
    • https://chorland-dining.com/webroot/editor-uploads/files/68146676423.pdf
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/47213700070.pdf
    • http://firewheels.pe/userfiles/file/deboxuzozagifisib.pdf
    • https://hargagila.com/uploads/image/files/buwabelovalogizo.pdf
    • http://www.sauminandy.com/fckimages/file/navodipaluzaz.pdf
    • http://uptownfallschurch.com/uploads/files/zitomizerisizese.pdf
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72816678891.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_off0000c9fc.bin
10108369cc0c42ef9ff9f0be0a9cbe29f9d375884b302693370b8e86c69f96b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FC 10492 bytes
font_01_sfnt_off0000e1e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E3 16792 bytes
font_02_sfnt_off0000f9f5.bin
efa8d00fc2b28bb712f62df0fea9a946738ba9c11e247d43baaba3ddc742f27c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F5 17804 bytes

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