Malicious PDF — malware analysis report

Static analysis result for SHA-256 6faa5180924b0b87…

MALICIOUS

PDF

71.5 KB Created: 2021-02-19 23:32:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 28274bf9e7c2d9cb64ab132c3fc19953 SHA-1: 28bf5aab282bebd26151add953ec7acc51e17ada SHA-256: 6faa5180924b0b873b8f09ab78e95628e2ad3bbe1a7d6be1a494b3329e848d6c
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 that point to disposable domains and link farms, suggesting an attempt to redirect users to malicious content or phishing sites. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a search keyword, reinforcing the idea of a lure.

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://leonvi.ru/wix?keyword=busybox+apk+pro PDF link annotation
    • http://todolosepaxo.iblogger.org/how_many_calories_in_a_4_for_4_wendys.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459788/normal_5fc9e94278de0.pdfIn PDF document text
    • http://cooldomen.space/french_acrylic_nails_square63rbb.pdfIn PDF document text
    • http://atlas-copco.su/wuxorow2838k.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/tZAhdgh/dune_2020_movie_toys.pdfIn PDF document text
    • http://tuguxanofa.iblogger.org/oxford_dictionary_pronunciation_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/hjcdrib/tap_race_3d_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/a3Eshc3/nexezisodisebamisogame.pdfIn PDF document text
    • http://tuworiki.22web.org/61108311626.pdfIn PDF document text
    • http://meblik.su/408252783717421z.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/8qmLhs9/pet_rescue_saga_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pininipata/1hbh1if/dc_comics_movies_in_order_of_story.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407314/normal_5fe03bd47e829.pdfIn PDF document text
    • http://digitalmicroteter.xyz/vidojagivutokojiridurabib57xjg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415929/normal_5ff5f98268593.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420014/normal_602c901a1d1bf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puredaw.rf.gd/aerosol_spray_paint_msds_sheets.pdfIn PDF document text
    • http://xediguvodolej.epizy.com/70429876733.pdfIn PDF document text
    • http://vateden.epizy.com/65214412253.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_off0000dc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9D 5204 bytes
SHA-256: bca3318546a8ea8472179735dc465578c6f5cd8ff1b535f659ed641254cefe69
font_01_sfnt_off0000ee6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 10148 bytes
SHA-256: 4f677f56c00753a2c9768f3d9dc36a3f70aed75e4c2f274a9887ec675e94651c

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