Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b929a6af3e2ad2…

MALICIOUS

PDF

103.1 KB Created: 2021-02-15 22:46:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 8b009f1ca3be00c381a53f6940c2e65a SHA-1: 4a9fd270932489bb97c152ca85627ce197d04f43 SHA-256: b8b929a6af3e2ad29cf1ca3e657126e9001b3fe8464e01db8ff88142196174af
134 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the overall structure point towards a phishing lure disguised as a user manual to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/strik?utm_term=iphone+6+plus+user+manual+pdf PDF link annotation
    • http://wbigs.space/magazine_ad_template_wordt5toj.pdfIn PDF document text
    • https://zesajuletolif.weebly.com/uploads/1/3/0/9/130969916/4c858978.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417806/normal_5fcee4682ed75.pdfIn PDF document text
    • http://yandex-dostav.ru/bad_romance_piano_sheet_musiclizoa.pdfIn PDF document text
    • https://visuwinewuj.weebly.com/uploads/1/3/1/4/131407241/bidigisutal.pdfIn PDF document text
    • https://cdn.sqhk.co/felinavaw/RUFjahf/motorcycle_wallpaper_iphone_11_cute.pdfIn PDF document text
    • https://cdn.sqhk.co/depivuni/hcjhO7R/into_the_badlands_blade_battle_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/xusorawoka/jdAggij/19663268268.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
    • https://s3.amazonaws.com/palikuvexake/muxutaxad.pdfIn PDF document text
    • http://gumupomomoripu.rf.gd/printable_address_book_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_off000147aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147AA 5124 bytes
SHA-256: 83e70b9b8e932b7799b5be38dd7b02a4ada13f87fc4abd23cdce9d1c5adac996
font_01_sfnt_off000158cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158CD 11908 bytes
SHA-256: 849c03c87e1b87c2f661076ffed191c7c8a43cbb21aa1ec4fb285dd3982e04bd
font_02_sfnt_off0001814d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1814D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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