Malicious PDF — malware analysis report

Static analysis result for SHA-256 30933b873b5ee8e7…

MALICIOUS

PDF

81.4 KB Created: 2021-03-17 23:30:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f975b89328299b71b984810709a04dd1 SHA-1: b52a5bcecacc26b11ff41db5f83d7d6da94e6743 SHA-256: 30933b873b5ee8e73e7508c7698addf18aa0dec68c8de3cff0efe51266c3f4d6
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'golowaki.ru', suggesting a phishing or malware distribution attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a deceptive link farm, further supporting the malicious intent.

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://golowaki.ru/123?utm_term=icloud+photos+library
    • https://cdn-cms.f-static.net/uploads/4413368/normal_6025e8f695bc6.pdf
    • http://segway-wheelchair.ru/realtek_audio_driver_windows_7_hp_pavilion_dv6000qkxvf.pdf
    • http://mebets.xyz/mission_antyodaya_baseline_survey_form_2019noqnn.pdf
    • http://remontlegko.info/what_is_the_icd_10_code_for_esbl_utitdpjf.pdf
    • http://bigwin-1xbet.fun/camunda_bpmn_autismoq9pc1.pdf
    • https://static.s123-cdn-static.com/uploads/4409798/normal_5fc7ebdd09bca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_9d663e829bc9415cafe9353d66b44b7a.pdf?index=true
    • https://s3.amazonaws.com/jarirotexab/mr_bean_cartoon_videos_tinyjuke.pdf
    • http://wulimazef.epizy.com/kavujupagurutigix.pdf
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_1a309d1e7f6c43fe83742914db19496f.pdf?index=true
    • http://sakoperuranabij.rf.gd/8433489255.pdf
    • https://s3.amazonaws.com/xapota/year_end_report_card_remarks.pdf
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_6783bd9ec3944bdb8f793592a1038fcc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c3abc64d-f473-4999-86ca-f8f884e84140/what_is_developmental_learning_process.pdf
    • https://uploads.strikinglycdn.com/files/5ca9deac-a607-429f-9698-19a3ca07c9ab/75795476765.pdf
    • https://uploads.strikinglycdn.com/files/528b0b48-22cf-48ea-8dbc-0d0229e5fd6d/measure_theory_for_beginners.pdf
    • https://s3.amazonaws.com/potamotaz/2777240406.pdf
    • https://s3.amazonaws.com/zibenoroduzuw/59304779856.pdf
    • http://lawupoxag.epizy.com/14472393052.pdf
    • https://s3.amazonaws.com/zarevizebi/rsum_cours_algorithme.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e3.bin
c669f381564831cc7ee2a1cd8157f0d9707fe9126f7ab435b7bd77ac95220f87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 4996 bytes
font_01_sfnt_off000101df.bin
839e7012eaeb4c28b013ec4dbbe03d7f962d73734eab9c07ca381df1324f56a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 11868 bytes
font_02_sfnt_off000128cb.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128CB 4324 bytes

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