Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7fa305909c7fc0…

MALICIOUS

PDF

67.1 KB Created: 2021-09-13 22:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2da99f5a0fb4a843c86acb43c3531d8 SHA-1: e27b1649a451bcefbe4081bf8db78fac1758d7c2 SHA-256: dd7fa305909c7fc0407964545564edaa2c237984e1e45d7255c3c4a53eb64ccd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm designed to redirect users to potentially malicious content. The embedded JavaScript is likely intended to facilitate malicious actions, such as downloading additional payloads or redirecting the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://smidgel.ru/uplcv?utm_term=themes+premium+apk
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131c6cb5f1bd---49181693362.pdf
    • http://chanakol.com/ckfinder/userfiles/files/gukofenovubatesunefuxa.pdf
    • http://albarossa.jp/js/upload/files/mipizarunexitojon.pdf
    • http://zerosquareonline.com/file/muzivapanuzex.pdf
    • http://jlicentral.com/images/authors/file/58684230820.pdf
    • http://a2kat.ru/userfiles/file/rokosagu.pdf
    • https://jagamimpi.com/contents/files/lenefivatobururufo.pdf
    • http://kdsonline.org/userfiles/file/75623989944.pdf
    • https://szallas-karpatalja.net/upload/4481384247.pdf
    • http://arucax.am/user_images/file/32904000286.pdf
    • http://uran-berlin.com/userfiles/file/94618858354.pdf
    • http://eegbiofeedback-leszno.pl/userfiles/file/guweno.pdf
    • https://al-farh-iq.com/upload/userfiles/file/rapoka.pdf
    • http://amexeuro.com/an3_Uploads/file/73635483263.pdf
    • https://rcvizovice.cz/ckfinder/userfiles/files/35592596559.pdf
    • http://abwingsde.com/uploads/files/67829170743.pdf
    • http://pol2-simf.ru/userfiles/file/84570511555.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/e252a1c01d201ba98b666815f8a46221/baruriledogafefotavubo.pdf
    • http://podolsk-kondicionery.ru/upload_picture/file/mokup.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/laniliwi.pdf
    • https://esvigo.com/upload/files/39112234003.pdf
    • http://gemwishrs.com/ckfinder/stones/files/23270519950.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_off0000ab6d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB6D 16792 bytes
font_01_sfnt_off0000c384.bin
6208b23055b96aebdda27253aee95c51da391bca374c342004c03c00e90b4a7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC384 10304 bytes
font_02_sfnt_off0000dab1.bin
6db4083491c50ef66aa7e4d5bed3492e6e849b50ceefca366e840f6290989cad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB1 14644 bytes

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