Malicious PDF — malware analysis report

Static analysis result for SHA-256 f603b5c611e8fb2d…

MALICIOUS

PDF

80.2 KB Created: 2021-03-01 09:23:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4a85139c876c4f4ab277b3ed65774664 SHA-1: 06f2619b032848b2d0c2100be35bbae258eea4bc SHA-256: f603b5c611e8fb2dd4bde4f085af7f3949f8a5e816fca190462a79fff38fbe2b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs, with a primary focus on a link farm hosted on Zajinet.ru and Weebly. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link aggregation, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/award?keyword=bose+ae2+headphones+replacement+ear+pads PDF link annotation
    • https://cdn.sqhk.co/wezufunin/eQY2ijE/yeet_definition_1700s.pdfIn PDF document text
    • https://kekorozonositen.weebly.com/uploads/1/3/2/7/132710750/c6f4cc.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/2017_chevy_ss_manual_transmission_for_sale79fxf.pdfIn PDF document text
    • https://dutudofedibajun.weebly.com/uploads/1/3/2/8/132815365/jojeli_jafuxufusow_xemakonogim_gapowozadus.pdfIn PDF document text
    • https://vozozexofevufut.weebly.com/uploads/1/3/1/8/131871902/valaju.pdfIn PDF document text
    • http://livethailand.fun/cat_room_cute_cat_gamesd7p7i.pdfIn PDF document text
    • https://balebapu.weebly.com/uploads/1/3/5/3/135322653/votukux.pdfIn PDF document text
    • http://store50off.info/myles_munroe_childrenifio8.pdfIn PDF document text
    • http://evgeniy-semenenko.ru/parapojau8vfl.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/bilegali_selinedutako.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/haaRKSU/84797826627.pdfIn PDF document text
    • https://mofibowego.weebly.com/uploads/1/3/1/4/131406437/xiranikimum-sogetejosapi-pikif.pdfIn PDF document text
    • http://tlgfree.xyz/tifomeworutj064m.pdfIn PDF document text
    • https://karegito.weebly.com/uploads/1/3/4/6/134626514/zexadefaramijip_kojegi.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/cjiifgf/my_wild_pet_online_animal_sim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kigavanus/lagu_addinu_lana_syubbanul_muslimin_stafaband.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/56971110869.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/zoruwenen.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/98467332586.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://scripts.sil.org/OFLIn 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_off0000e4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A4 5496 bytes
SHA-256: 52aaaea8a1d109b4155dc1b78a22e1e927273ab4159b98166bc41d2d64012abf
font_01_sfnt_off0000f72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 11352 bytes
SHA-256: 86ada2008b3c03223206a846dfd8925a40a6ec7840b392a90e9ffb8748822369
font_02_sfnt_off00011da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA1 16344 bytes
SHA-256: 7e0863d6dcdfe3ce59f67395a06e5e8634226e44f713773c85e494ff6d119ee1

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