Malicious PDF — malware analysis report

Static analysis result for SHA-256 a126c6cff66bd2a8…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 20:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4add62923a74a4a755013d48485733c2 SHA-1: ac51436c6bdb10bd3f3e5be7e197662b647f3ce7 SHA-256: a126c6cff66bd2a8399362fbfd6fc763158e7d1b86b77b46965f2c02aa0f0abf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to various domains, many of which appear to be disposable, forming a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern. The embedded URLs and the overall structure suggest an attempt to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ratsimae.ee/media/contents/file/7916743166.pdf
    • http://ride.hu/images/uploads/files/vojozusoza.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/2e4fc95d5d88e55623dde10c19ea0ba2/39846790141.pdf
    • http://lustigersteirer.at/userfiles/file/74991132865.pdf
    • http://s2ipower.com/survey/userfiles/files/gozodavemaruma.pdf
    • http://bndweb.nl/upload/files/navutorixoxamotejubibirap.pdf
    • https://pbpkrosno.com/fckfile/vazukominatodek.pdf
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/72420469479.pdf
    • https://efckrakow.pl/userfiles/file/69341850156.pdf
    • https://petribax.nl/userfiles/file/45025188164.pdf
    • http://bluecars.pl/userfiles/file/fusizivuguj.pdf
    • http://findacommodity.com/upload/file/jorav.pdf
    • https://cathita.vn/upload/files/58124200245.pdf
    • https://trisyscom.com/userfiles/file/5778587004.pdf
    • http://cofetariafraguta.ro/UserFiles/file/2715458361.pdf
    • http://textingrights.com/userfiles/files/70521387165.pdf
    • http://autoscuolauniversale.it/userfiles/files/86537965559.pdf
    • https://studiecarriere.it/uploads/file/xebukonivexumuteroj.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/51874157428.pdf
    • https://cncunse.com/d/files/pivitonutinojizuzu.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f10eb717c0---48426193888.pdf
    • http://nifaelectronics.com/userfiles/file/31637526453.pdf
    • http://skomi.ru/img/files/file/86910375093.pdf
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/lureliwuvisibuwewajoguso.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/futudixivapatapani.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=can+a+ps4+controller+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_off0000d7cd.bin
b428eb5ac897bbaa80171d816b807813fd14918bfbe08865730fa01588165001		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CD 10796 bytes
font_01_sfnt_off0000f0e9.bin
20488b7db87e40f78e6c0796bde090ca92a1a0c090de28b705a4b18d9a2491e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 17928 bytes
font_02_sfnt_off00011fbd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBD 16792 bytes

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