Malicious PDF — malware analysis report

Static analysis result for SHA-256 382d66c015a44b25…

MALICIOUS

PDF

70.8 KB Created: 2021-09-28 22:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2cdd0e5e56aa4661fb6feeeb27c85aaa SHA-1: 157171ddc571f18afbe21daa20149efb76e0b3cc SHA-256: 382d66c015a44b2590206383692a848422fbb31fdba3c293b9e9f0e22b56657d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The presence of these links suggests an attempt to direct users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://synerhu.ru/uplcv?utm_term=2048+poker+apk PDF link annotation
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471a0c55104---kelajini.pdfIn PDF document text
    • http://aurora-c.jp/files/files/27219101969.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/61970434558.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/fuluzupesaviwojumunoxefu.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/zinorukinumuv.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/dolirogexumimewizage.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/walutawadile.pdfIn PDF document text
    • http://millecolori.it/images/file/vutilusud.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/64805320124.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/suninowago.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/reloviduwutunojujojiw.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/45398663743.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/wudefawogibenufivuvu.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/3287159051.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/79082320909.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210927_F9AEBDD4FA2CE72A.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/morabisusudunerazim.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/65948526770.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/sovimatavenenevodezujoku.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/58264423772.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/lojabikasu.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/88263391638.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAF 18212 bytes
SHA-256: cec23f5a4ce2e6ca3a073c92103dad7739690722aa8e541595a4ab12c950861f
font_01_sfnt_off0000df05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 10260 bytes
SHA-256: 2f3715129d1c26c4be947c571d56f1daf945247d267da50257b2735942b12bc8

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