Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2f176488fb0226…

MALICIOUS

PDF

74.4 KB Created: 2021-04-02 21:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c538a7115eebc0edf543227063914f9c SHA-1: 2ca9ac10bc9ae4e2e418288ac79f304e9bf34047 SHA-256: ca2f176488fb0226503134dcb4b71630c332ef7fcb6f3182cb450fccdc21e896
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, with one prominent URL leading to a suspicious domain that is likely used for phishing or malware distribution. The PDF structure and embedded content suggest an attempt to disguise malicious intent, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=the+law+of+trusts+and+trustees+pdf
    • http://job-finder.space/used_motorola_xts_5000_for_saleohcy3.pdf
    • http://sikutamilom.iblogger.org/47175261145.pdf
    • https://cdn-cms.f-static.net/uploads/4366364/normal_6011d49d72d10.pdf
    • https://cdn-cms.f-static.net/uploads/4403271/normal_5fd640dab5a84.pdf
    • http://good-production9.site/sofurelitiditezixe1sb0g.pdf
    • http://boothattendant.com/undoing_project_reviewfdx7x.pdf
    • https://static.s123-cdn-static.com/uploads/4369187/normal_600828cdf346d.pdf
    • https://vaseviga.weebly.com/uploads/1/3/3/9/133986607/nofakotebep-xelaragenu.pdf
    • https://memuwumobodedo.weebly.com/uploads/1/3/5/9/135974490/xubefajexatudor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zikeko/identifying_logical_fallacies_worksheet_answers.pdf
    • https://s3.amazonaws.com/betefowubevat/angular_6_interview_questions_and_answers_github.pdf
    • https://uploads.strikinglycdn.com/files/8c535c5f-816f-4ded-97e7-7e491328520b/miniature_dachshund_puppies_for_sale_carmarthenshire.pdf
    • https://s3.amazonaws.com/jeponowon/high_voltage_transformer_testing.pdf
    • http://kufosejuwures.rf.gd/origami_box_instructions.pdf
    • http://tiwojojerat.rf.gd/asphalt_8_android_free_full_version.pdf
    • https://uploads.strikinglycdn.com/files/75e0fa84-8a42-4680-8198-cabf7c28517b/65922796833.pdf
    • https://s3.amazonaws.com/tidigudetefumof/84523047225.pdf
    • http://kaxasasetepub.epizy.com/obat_enteral_adalah.pdf
    • http://zoxutuperovizo.epizy.com/55995119774.pdf
    • https://s3.amazonaws.com/viregujipowuru/mafuwijisuvuji.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e86a.bin
12e62aaec0646dc07941e6892928826bc51dba25f8c189b4582c287c023d27db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE86A 5168 bytes
font_01_sfnt_off0000fa0c.bin
d5a6e7afcab448f719b348fe18c74a6a1cc1814dd6c66e477a5237780667d3ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0C 9944 bytes

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