Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3185a4b0c25d1a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 14:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1139de1ff63105dd8276c5fb840f9f0c SHA-1: 3eb5d59008e6893ecdc87a89a9c9a0767495f62b SHA-256: 0b3185a4b0c25d1ad9490b343e0ed87ae3df113bd1b4ad8f72769eab7d291c2a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The document body is heavily obfuscated and does not provide clear textual content, but the presence of external links and the heuristic firings suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://pixomot.ru/uplcv?utm_term=how+to+download+movies+on+yts+using+android+phone PDF link annotation
    • http://top1np.com/ckfinder/userfiles/files/62763366305.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/sazafuli.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/49158871411.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/sopunej.pdfIn PDF document text
    • http://vinmexindia.com/uploads/dupamikegi.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/pegalodanobipojomugu.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/70301088651.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/2715540093.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/23028798164.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/pokojifibofemiv.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/99997226289.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/26868882577.pdfIn PDF document text
    • http://orderkai.com/uploads/files/47518428796.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/etu2ccdf9a42l4cot4id770bfm/xowerawitone.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/89865839041.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/letapebuxarujovojomeke.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/70062982756.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/38583636249.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/9428157545.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/13021921471.pdfIn PDF document text
    • http://ridendo.cz/files/file/80334200724.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_off0000d421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD421 17916 bytes
SHA-256: aa4aed697734b41a20c28dde6cea98ea40c78a45c7fdb4367522d32009cd1309
font_01_sfnt_off000102bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD6 11196 bytes
SHA-256: f811f086b7747ae82bae12ea55db9e32eebe9aae817cefa0bfb4053af9a58f93

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