Malicious PDF — malware analysis report

Static analysis result for SHA-256 838ab45fa9d834a6…

MALICIOUS

PDF

88.2 KB Created: 2021-05-13 15:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d4ef73ca81d6fedd27cc732d992dc852 SHA-1: 88c40f18edf2a29cae4a73f539656b58b73d5626 SHA-256: 838ab45fa9d834a63dfae64e507b486bb946aa5e90c7c553aa450371086212fa
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains multiple embedded URLs, with one prominent URL pointing to 'baarspo.ru' and containing 'technical drawing program free download' in the query parameters, suggesting a lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the malicious intent by identifying a link farm on disposable hosting, likely used to distribute malware or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/strik?utm_term=technical+drawing+program+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374715/normal_602a8ade1e438.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486037/normal_5fdbc3a3e0881.pdfIn PDF document text
    • http://orbitan.fun/case_in_point_7th_edition_free_download16euz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485689/normal_60345e8931a6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472216/normal_5fd9bd2bed94f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420764/normal_602fd21d2b9f1.pdfIn PDF document text
    • http://strapslap.online/ruletebanavojujise1c48n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468268/normal_603c5043574a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479462/normal_601b1a69c3278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463794/normal_6061ace7e24f4.pdfIn PDF document text
    • http://iclod.tech/warhammer_40k_rulebook_free7iuyf.pdfIn PDF document text
    • http://beautytopshop.site/mcgraw_hill_wonders_kindergarten22grc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500447/normal_60051254121c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495399/normal_606dd85311663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_605f774c0f52d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_600e5b27c034e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477655/normal_5fd60e318c0f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4d70ce67-7e66-4b52-ad7d-67a4cfdfcca1/fluid_dynamics_game_development.pdfIn PDF document text
    • http://fosekor.epizy.com/79489194958.pdfIn PDF document text
    • http://lavufufoludu.rf.gd/degovirano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87c83bb5-757a-496e-bdf7-287dbeda4ad2/kapusebumutabogijefe.pdfIn PDF document text
    • http://fapuvonez.epizy.com/voicelive_play_electric_vs_gtx.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E69 5140 bytes
SHA-256: 05f63a6fbac5d9a75a0878416d30b5422115f94e6431c899ec3a6f3775122b3a
font_01_sfnt_off00011fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB2 10844 bytes
SHA-256: 4dd13d0bbcefb61e0e5ba57e4a71778c970363de49d0274a416a382756bb7da4
font_02_sfnt_off0001448f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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