Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd60a2b388bf315…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 02:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 659f04227f50f1115c7c99bd3cb2783c SHA-1: 5d3659969e381227b6e927a5253665adb0ff415e SHA-256: 6cd60a2b388bf3159178988d39d798712c1a0f510e383390ab77c7b6a0974200
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The PDF structure and numerous links point towards a phishing or link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://openendrep.com/userfiles/files/kezotet.pdf
    • http://www.moyekolodin.com/files/22129185730.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/50041490936.pdf
    • http://bukharajohnscreek.com/sites/default/files/file/kilonozaviniwipexewizo.pdf
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/dadizinakojipu.pdf
    • http://pegastelco.com/pictures/files/tinosizuwa.pdf
    • https://ebal.ro/app/webroot/files/userfiles/files/40237254937.pdf
    • http://julianina.de/upload/file/72345564345.pdf
    • http://cold.lt/userfiles/file/47845310897.pdf
    • http://seattledesis.com/fckeditor/file/87971112495.pdf
    • http://saga.diamonds/uploads/ckfinder/files/fujafig.pdf
    • http://csc0351.com/userfiles/file/20210916091742_ongcye.pdf
    • http://bilmatbasim.com/userfiles/file/99472075995.pdf
    • http://influences-vegetales.eu/assets/Image/files/4456230288.pdf
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/45223908544.pdf
    • http://geose.ru/userfiles/file/3976736072.pdf
    • http://francescofesta.it/userfiles/files/tesenixerukafuvosuf.pdf
    • http://sentralperdana.com/file/wobupewukado.pdf
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/32929814076.pdf
    • http://cafesezony.ru/fck_editor_files/files/61545011925.pdf
    • http://snft.ro/media/file/64804732286.pdf
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/30905440822.pdf
    • https://vipbeachhouse.com/uploads/editor/file/28295078972.pdf
    • https://businesslife.com/content/file/81769783280.pdf
    • https://limadelimon.com/images/file/kolanoj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+is+adb+driver
    • 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_off0000d966.bin
2d0ac4493aa391999b6534d237f11e75abeed4627e60b346da9124641f999da0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD966 16612 bytes
font_01_sfnt_off00010439.bin
da6fb8a6acffb2d4dd2262108a1c9d5e392810890891484891a20cf46492f139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10439 10272 bytes
font_02_sfnt_off00011b87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B87 16792 bytes

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