Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c9756b72e98a9c…

MALICIOUS

PDF

74.5 KB Created: 2021-03-15 17:18:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 593893443750d62630e114bab4dbb191 SHA-1: e1e21d2b4c7115fb1ccff4fb26fb2e30666c20cf SHA-256: e5c9756b72e98a9c3a04ca76b932fa2c1b1628c76e437a5a4b67148344301ccf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting or link farms, indicating a phishing or spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/award?keyword=baris+dan+deret+aritmatika+dan+geometri+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4415767/normal_5feee9e80d2ae.pdfIn PDF document text
    • https://cdn.sqhk.co/zelosoza/LAmhdia/answers_to_picture_perfect_crossword.pdfIn PDF document text
    • https://gafojeted.weebly.com/uploads/1/3/1/4/131452963/cf60f040f673e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472475/normal_5feb26ae23669.pdfIn PDF document text
    • https://kuritemu.weebly.com/uploads/1/3/1/3/131383398/3869421.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefima/hgHZih7/follower_count_not_updating_twitch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480897/normal_5fe13da5e56bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476750/normal_5fd7dd295dfb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485446/normal_6024733ed3c2c.pdfIn PDF document text
    • https://muwikilakejo.weebly.com/uploads/1/3/4/5/134519857/gukoxixod_xeritu_jinojo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422372/normal_60328991e1a02.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/fibjaVu/panilimijo.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://zisekajoreva.epizy.com/android_5_sign_out_of_google_account.pdfIn PDF document text
    • http://bibuxidon.rf.gd/icao_annex_13_10th_edition.pdfIn PDF document text
    • http://fosekor.epizy.com/64364843740.pdfIn PDF document text
    • http://nemowuroniru.epizy.com/chimera_tool_full_cracked_free.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_off0000dae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 5228 bytes
SHA-256: a075ce6168f331260ac6042a0010f15c7aebae73d172fd3bb889772b559b3b92
font_01_sfnt_off0000ec99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 9980 bytes
SHA-256: a2b72f1e53698c0df7f99dea4bc677a3510341e8e24b4a78ffb4acf0ec2fda43
font_02_sfnt_off00010ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED5 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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