Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fa05329787627e…

MALICIOUS

PDF

79.7 KB Created: 2021-09-24 11:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4700066ea3165184b97174e1776d49e SHA-1: fce158e0735711a37fabd24b8736a70a2a0bd9c9 SHA-256: 75fa05329787627e66169c06cc4bac5f1dd0319e04be9525085c8af09bc88a08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV and an ML classifier flagged this PDF as malicious, with ClamAV identifying it as a phishing trojan. The presence of embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=nomao+camera+apk+download+android
    • http://etspak.com/survey/userfiles/files/96744923645.pdf
    • https://vibangthuaphatlai.net/uploads/files/59341335678.pdf
    • http://stickerbarcode.com/file_media/file_image/file/zoganavudome.pdf
    • http://ruresept.ru/files/file/25780216807.pdf
    • http://nomayaku.com/userfiles/file/jijejilabolasapenowaj.pdf
    • http://historia-bfured.hu/userfiles/file/lurifixom.pdf
    • http://maremio.ru/admin/ckfinder/userfiles/files/12471376847.pdf
    • http://www.binghan.my/userfiles/file/40357163957.pdf
    • https://pasarantogel.com/contents/files/90738775629.pdf
    • http://builderall.info/userfiles/file/13662113310.pdf
    • http://alda.pl/ckfinder/userfiles/files/47696770928.pdf
    • http://naplesredeals.com/userfiles/files/musewazuzinelavij.pdf
    • http://ieltsadd.ir/cache/fck_files/file/54198998303.pdf
    • http://kapalishakti.com/ckfinder/userfiles/files/tekujugaremisumebi.pdf
    • http://alothongtin.com/upload/FCK/file/13666212091.pdf
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zupesozodojiwetinujagi.pdf
    • https://alteanetworks.fr/img/file/botagejazukujip.pdf
    • https://fidelishospice.com/ckfinder/userfiles/files/954156003.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/f4e592e893dbfb88efe6e507dde46294/jopuj.pdf
    • http://rhondachem.com/d/files/38087440696.pdf
    • http://moskvaznaet.ru/upload/files/mikikeb.pdf
    • http://basketaci.cz/UserFiles/File/79396747468.pdf
    • http://hndgyl.com/v15/Upload/file/202192157425765.pdf
    • http://street.bpv.su/content/files/files/36928171611.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_off0000d3e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 16792 bytes
font_01_sfnt_off0000ebfc.bin
30d9a4bfe1664f3e1a801b513bd9aa65830006b4b587c3bf53b23849d771c0a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFC 10564 bytes
font_02_sfnt_off00010406.bin
5a92853ad3276674c5f93b4be46e310849377a740f0ebf46c50412a27d3bef2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10406 17824 bytes

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