Malicious PDF — malware analysis report

Static analysis result for SHA-256 851f1f03335d3792…

MALICIOUS

PDF

66.9 KB Created: 2021-03-01 14:39:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b46e7b96599d930b9b0173a79c17993f SHA-1: a3761979bee337007841432ccc9a520bedb87114 SHA-256: 851f1f03335d3792618eb7fca20e66365b4714b3ded9023f916df28c7c8abd13
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jumiwimov.ru/wix?keyword=kingsizedirect+com+customer+service+phone+number PDF link annotation
    • http://tufuwavaziga.mygamesonline.org/zeratewaseginosewoguni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408004/normal_5fc5e98ed812f.pdfIn PDF document text
    • http://kufizuvepopes.22web.org/rokonejozig.pdfIn PDF document text
    • http://zhk-samolet-krasnodar.info/kokapixanuvozebiw0l3dq.pdfIn PDF document text
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/1739462.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482636/normal_5fea26a5d3748.pdfIn PDF document text
    • http://simultaneously.space/27371371285r5jek.pdfIn PDF document text
    • https://tijoramamuguko.weebly.com/uploads/1/3/5/3/135390581/ee617.pdfIn PDF document text
    • http://timecodes.net/disturbed_asylum_albumljngq.pdfIn PDF document text
    • http://naturebiolog.fun/62473018981fb2hv.pdfIn PDF document text
    • http://omynutural.space/gagubisusudofupalibuwote4j0aw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vokesakogo.onlinewebshop.net/dokosovovejimomuzefa.pdfIn PDF document text
    • http://gotupodejepu.rf.gd/61534419329.pdfIn PDF document text
    • http://maboduxivugiv.rf.gd/siemens_plc_software.pdfIn PDF document text
    • http://ratobewiwigu.atwebpages.com/volumes_of_cones_cylinders_and_spheres_matching_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/kobeselerefipidotipedo.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CD 5464 bytes
SHA-256: 9090ab4d2240a455ccc3648244d5fa4e9d1f7a7d06b9ad686e751ecd82d47aa0
font_01_sfnt_off0000db51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 10372 bytes
SHA-256: 937d201a97ec20f296ec59f537d3ca3d6114c7940c5461fea0160ed9beccba6e

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