Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a2b45b57d7e007…

MALICIOUS

PDF

79.4 KB Created: 2021-02-25 08:12:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2e3be82b4f423bd2ed623bd1e118c158 SHA-1: d1e8a0be62f5c623451e1429228236ace9134a4d SHA-256: a7a2b45b57d7e0076aa6f47fabc1a213474abcd95aa10b99eeadce9409811e3e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable hosting and potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=barter+6+zip+vk PDF link annotation
    • https://cdn.sqhk.co/serodozire/ighg6gi/celebrity_cruises_2020_northern_europe.pdfIn PDF document text
    • http://japadalifu.22web.org/beyond_the_edge_english_subtitles.pdfIn PDF document text
    • http://org-fruit.space/zepularizeba352ds.pdfIn PDF document text
    • https://cdn.sqhk.co/bagudivibi/MchciiL/reports_follower_story_analyzer_for_instagram.pdfIn PDF document text
    • https://cdn.sqhk.co/vudebalox/zgcijIV/minimal_escape_stage_2-_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383921/normal_5ffdd7ffe3dae.pdfIn PDF document text
    • http://kino-vezde.ru/suzuki_m109r_performance_partscfc4w.pdfIn PDF document text
    • http://bejizewugo.iblogger.org/xibofamimubelofat.pdfIn PDF document text
    • https://cdn.sqhk.co/lowimipofevu/hhVGPVh/kefuvowopuxevaguwovi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389352/normal_6028a9d460e95.pdfIn PDF document text
    • http://markettop.pro/18064844963w5h9.pdfIn PDF document text
    • http://power-guard.shop/high_volume_ringtones_free_download26tgl.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/fje7ie9/kuletele.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/losiduvitezebepegaha7k7.pdfIn PDF document text
    • http://kikaxefe.22web.org/keraxasu.pdfIn PDF document text
    • https://cdn.sqhk.co/zanivuwiduvo/jhixfkl/tiginuvebakeluvex.pdfIn PDF document text
    • http://pedaropira.22web.org/vigejawagumumu.pdfIn PDF document text
    • http://baltika-trans.com/lobby_roof_pop_designqq9vd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417205/normal_5fe54e112cbee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vanomuwoz.epizy.com/ccrpi_calculation_guide_2019.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC33 4980 bytes
SHA-256: b188704863588d76b9a214cf34199e4af10d2c7779bcdf98b2144e4352400955
font_01_sfnt_off00010d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D45 10316 bytes
SHA-256: 4b926547cb999c7b2c7dce4607a586882429690aae6b822f750b4a056c92fe34

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