Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb147e12a2f51705…

MALICIOUS

PDF

79.7 KB Created: 2021-02-13 13:22:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 821459c370729095e60d304c40a5219b SHA-1: d75666549112a272e006131faafe68531c145acb SHA-256: cb147e12a2f51705ff5c280702cc2b8cf4c46bef276e41d3ca4f2ec6589038a7
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution attempt. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious content or phishing pages. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest this is a lure document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/aws?utm_term=android++file+from+url+example PDF link annotation
    • http://closemaze.com/jejawapifevavvw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402936/normal_601df6d8a3e45.pdfIn PDF document text
    • http://tublitalia.space/gw2_what_to_do_with_unidentified_gearqf36l.pdfIn PDF document text
    • http://shopsmmv.site/chatham_high_school_athletic_forms8mscu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450438/normal_6000e6a416631.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/hia0jac/3442593589.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/6xhapmc/rise_of_empires_ice_and_fire_pc_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451023/normal_600e2fb02b86f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411682/normal_5fe15d5f9c65e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419654/normal_601d265f24e0e.pdfIn PDF document text
    • https://cdn.sqhk.co/kasavakujosi/iUihNPY/the_long_dark_riddler.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469827/normal_6003bbc66f352.pdfIn PDF document text
    • http://birjand.design/chopin_sheet_music_preludeb12c0.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
    • http://witosef.rf.gd/42323666176.pdfIn PDF document text
    • http://zabesawafusoxa.rf.gd/pufapedap.pdfIn PDF document text
    • http://vefelazubogimew.rf.gd/vonufodovokex.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_off0000e111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE111 4868 bytes
SHA-256: 220cb657535379d33def5a852621a1eb974d5f8e7adee70f9a4a4dd18adb54ac
font_01_sfnt_off0000f172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF172 14988 bytes
SHA-256: e0486c9505f907cdd32f88410cbe71b840880b4797b6d56d490c1eff3a4445bc
font_02_sfnt_off0001212e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212E 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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