Malicious PDF — malware analysis report

Static analysis result for SHA-256 802dbaf1d1ad8324…

MALICIOUS

PDF

68.3 KB Created: 2021-09-11 16:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e430e339b279441398eb63f1d80a7f1 SHA-1: 9138e1f7d0d22da215e25b89fcce4307291b7e06 SHA-256: 802dbaf1d1ad8324ba767f79893090d0064bbfb97af01a3142b70a0a6c1ee515
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to potentially malicious content. The document body is unreadable, but the presence of many distinct domains and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://penmypoem.com/new/admin/uploadfiles/file/41540000364.pdf
    • http://hanasushimenifee.com/uploads/files/46423759244.pdf
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/60970687646.pdf
    • https://kar360.com/resimler/files/93513870680.pdf
    • http://shannonlakeestates.org/fck_images/file/33860342735.pdf
    • https://hanurichurch.org/ckfinder/userfiles/files/10378522536.pdf
    • http://www.annaleehuber.com/content_files/file/robebidiwofogutaxotibu.pdf
    • http://tysons-cafe.com/uploads/files/45869180770.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7696e03ea---tawonelunotadufuxipebop.pdf
    • https://sportuna.be/ckfinder/userfiles/files/58254764353.pdf
    • http://gelikonline.ru/content/Files/77550029702.pdf
    • http://massarentearchitettura.com/userfiles/files/debisuxubod.pdf
    • http://elencostruzioni.it/userfiles/files/pebetitevitaxok.pdf
    • http://sooclose.eu/upload/File/gezawipesokeloxipabesupa.pdf
    • https://igraonica.me/userfiles/file/padaporizasigejiwi.pdf
    • https://webmenuplus.com/images/file/gitufejapirubinuno.pdf
    • http://abwlargo.com/uploads/files/xepipufoje.pdf
    • http://noithatdangcap.vn/app/webroot/uploads/files/kuniwutilu.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/talubadagakode.pdf
    • https://shop-ecobati.com/medias/upload/files/57579880528.pdf
    • https://www.prshots.com/ckfinder/userfiles/files/xodokasegaruvaxaze.pdf
    • https://aldaserwis.pl/ckfinder/userfiles/files/letofetomipi.pdf
    • http://artc-polymers.com/upload/images/files/faruwojuruxawejorixavudu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+does+cast+work+on+android
    • 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_off0000ae27.bin
2a179b4977ce44ed79f0e21c8cb4d7badce0dffc0f16b4930eeb4b3436c56e81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE27 15112 bytes
font_01_sfnt_off0000d3f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F1 16792 bytes
font_02_sfnt_off0000ec08.bin
c5e9d9a7c47aeac1002dc1e9949ca6d14133b948ee39dd810000c9c0b5cc7dfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 10484 bytes

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