Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f8a04ead9eb714…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 15:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d717403eeb0af2a8faceffd237fc8ec7 SHA-1: 8d8e2d8601a518c9e9554e521c5352e622cb2960 SHA-256: a9f8a04ead9eb714c67d01a56036510325b2886c4251993f903eaae9d08ff6c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs, despite some being marked benign, point towards a deceptive pattern. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://odlingfamily.com/userfiles/file/magedo.pdf
    • https://www.cascatai.com.br/ckfinder/userfiles/files/devuluzakokozakiwabor.pdf
    • https://xuanhongkhang.com/upload/files/58042865622.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/nelajeliru.pdf
    • http://budropol.de/Upload/file/71291336686.pdf
    • http://naturpix.ch/cmsimages/file/fudagisenik.pdf
    • https://journeywithmypet.com/ckfinder/userfiles/files/16477586915.pdf
    • http://slsnn.ru/content/files/tiremexu.pdf
    • http://kbo.pl/ckfinder/userfiles/files/22844301778.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edd1f9a23e---kixewitupelafijiweli.pdf
    • http://xn--80aesyq.xn--p1acf/files/file/66629413696.pdf
    • https://ldoris.com/upfile/files/20210904035100.pdf
    • http://caratow.eu/userfiles/file/38138979141.pdf
    • http://rszm88.com/upfolder/e/files/20210905075104.pdf
    • http://superazs.ru/images/news/file/juwivisadamumimuf.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136d728a923e---futudufap.pdf
    • http://studioghittigargnano.com/userfiles/files/4936469388.pdf
    • https://jobtiara.com/files/files/91484722003.pdf
    • http://ekonopuntos.com/campannas/file/biletebepikevejerujo.pdf
    • https://mkycc4.com/kycc4.com/userfiles/files/80665107453.pdf
    • http://www.pilartangguh.com/file/sezoxinodekitufijateko.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=play+pokemon+crystal+on+pc
    • 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_off0000d544.bin
b0b278e4a0c4736ef8ac7475770999d714f3c8e2f400a4a13a0859be2cad6301		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD544 19728 bytes
font_01_sfnt_off00010946.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10946 16792 bytes
font_02_sfnt_off0001215d.bin
59c7e4eab358cea626239bbb10c77dedc8bc8301b22fadc9572caa5ae1534a7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1215D 10652 bytes

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