Malicious PDF — malware analysis report

Static analysis result for SHA-256 4148437b33bf6af8…

MALICIOUS

PDF

102.1 KB Created: 2021-03-20 07:10:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8d77d5d820b6dfac39b8e41be98bee1c SHA-1: 18a045e49cc7dc72cf627653bf1cebc5f34a8759 SHA-256: 4148437b33bf6af84c6f8f70f7f1d6dd1201e84927a6cdba7cb030b8b7c5695b
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 0.9996

Heuristics 6

  • 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.
  • 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://baarspo.ru/wix?keyword=neat+receipts+manual PDF link annotation
    • http://excschool.ru/nespresso_uk_advent_calendar_2020mvh7v.pdfIn PDF document text
    • http://zumusepawasa.iblogger.org/huffy_beach_cruiser_comfort_bikes_20_24_26_inch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465392/normal_5fe75e22aa3d2.pdfIn PDF document text
    • http://balifruit.com/brian_friel_translationss8j5v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366048/normal_5fe302c0394b5.pdfIn PDF document text
    • http://dietnatur.fun/lewolowibujadepoodxff.pdfIn PDF document text
    • https://cdn.sqhk.co/dagosasojo/dtpQjgR/16768865747.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/jeghdid/samsung_s10_ringtones_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/hfqcgem/jomop.pdfIn PDF document text
    • http://best-store.club/adjectives_of_character_worksheetf889e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_600ea827f0a23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490516/normal_6012f03ee151c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444885/normal_6006bc2d4ce60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://basapixukeg.rf.gd/vojufazosos.pdfIn PDF document text
    • https://f50ece36-1901-4a7b-9396-968a400df7f4.filesusr.com/ugd/3ecb95_c53a343e20ed4b168b7e30219831f0da.pdf?index=trueIn PDF document text
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_14ef1e5187a44934842f82525aac6519.pdf?index=trueIn PDF document text
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_8b3c7fa0f260403889ead8c403b3fd91.pdf?index=trueIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_3e42e943affe4347b97d86e14fadc36c.pdf?index=trueIn PDF document text
    • http://xinudigiwuwa.epizy.com/correction_brevet_maths_2019.pdfIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_6a92d4555fe34de2b57c9d9c00872938.pdf?index=trueIn PDF document text
    • https://f5d5bca3-0ffd-41e3-a77d-3d805a1e43e5.filesusr.com/ugd/4e23ca_b96580a712d248b3972766da8462ce55.pdf?index=trueIn PDF document text
    • http://pubitawiwinas.rf.gd/53394645857.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_off000154a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154A8 5048 bytes
SHA-256: 0028b8bf1089324f14dd593f4cf7f1a1f1e5a014c5c4e16ddcb558413b87d4d0
font_01_sfnt_off000165bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165BF 11080 bytes
SHA-256: 7bd4ea4c8f535d70ddaef5ce8815612cea37c79b6e19d30315be9f4ca81fc6ca

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