Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b06d85de73e768d…

MALICIOUS

PDF

84.6 KB Created: 2021-06-05 19:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8a1379ff9bdcb5c98e9e7794ba0b1a2c SHA-1: baa3c71e3db46b9ad3e1a91cff5e8871a21207be SHA-256: 0b06d85de73e768d05b5618ff4d491f4bbb03b6228c85b5f4b72654a9978b266
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, with one prominent URL pointing to 'chcial.ru'. Heuristics indicate this is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. No scripts were extracted, but the overall structure and embedded links point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7184

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://chcial.ru/pbw?utm_term=how+to+read+landis+gyr+g370+gas+meter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366045/normal_6011bd716300b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456671/normal_6001007ce82b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387226/normal_60258a3a5042f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379045/normal_5fec1185a76dc.pdfIn PDF document text
    • https://babobulelemin.weebly.com/uploads/1/3/5/3/135344535/1832854.pdfIn PDF document text
    • https://peniwifagupe.weebly.com/uploads/1/3/0/7/130738894/a16744c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501975/normal_6052a94715a3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469359/normal_603137cf4468c.pdfIn PDF document text
    • https://dobukikiwaf.weebly.com/uploads/1/3/5/2/135295041/d209be2745dbd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485943/normal_606cb3b036a09.pdfIn PDF document text
    • https://vowomupow.weebly.com/uploads/1/3/4/8/134846305/jotajerosi-suxezijodoza.pdfIn PDF document text
    • https://bejutenexej.weebly.com/uploads/1/3/3/9/133997629/saxinovexob.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://tazijebep.pbworks.com/f/jowokunamiv.pdfIn PDF document text
    • http://jezopisi.pbworks.com/w/file/fetch/144666579/possessive_adjectives_esl_lesson_plan.pdfIn PDF document text
    • http://fufitan.pbworks.com/w/file/fetch/144634587/streaming_fast_and_furious_7_subtitle_indonesia.pdfIn PDF document text
    • http://sinorodolu.pbworks.com/f/16525073683.pdfIn PDF document text
    • http://ronuzexem.pbworks.com/f/domet.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/w/file/fetch/144619857/what_are_the_3_types_of_communication_media.pdfIn PDF document text
    • http://buvulareka.pbworks.com/w/file/fetch/144672693/fewirokamawesifikoni.pdfIn PDF document text
    • http://goxeguj.pbworks.com/w/file/fetch/144643878/41048301622.pdfIn PDF document text
    • http://bupataved.pbworks.com/w/file/fetch/144421221/63138483214.pdfIn PDF document text
    • http://gopidam.pbworks.com/f/poemas_para_despedida_de_la_escuela_primaria.pdfIn 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_off0001047c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047C 5476 bytes
SHA-256: 58a23808315e82b6bf2df46fc57c50adfdd1b8ceb599f25bdecd9b8679fd0f32
font_01_sfnt_off0001171a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171A 11908 bytes
SHA-256: 6a1c008472af97a190e05e13e5c66e7d37548a1c8e6bb7f4ff4edbc5574e02de
font_02_sfnt_off00013f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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