Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc689b7472145198…

MALICIOUS

PDF

75.1 KB Created: 2021-04-05 02:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f07f545dc4b1d322caaf162f874dc75f SHA-1: c7f5994fd7aa4e51cb6343bf080a5ed5a893c7f6 SHA-256: cc689b747214519877466c04f0bf289bef591b6d019c22f968ec6be78e2c915b
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure. The presence of external URIs and the link farm heuristic strongly suggest the document's primary purpose is to redirect users to potentially harmful websites.

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://zajinet.ru/aws?utm_term=quran+transliteration+and+translation+in+english+download PDF link annotation
    • https://fiwobezamarevev.weebly.com/uploads/1/3/2/7/132740324/9137506.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409609/normal_5fe179d8ef670.pdfIn PDF document text
    • http://moxolesapudeli.22web.org/cfop_method_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494166/normal_5fc9e314b35e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413119/normal_605d7c7700074.pdfIn PDF document text
    • https://femuketidoxesi.weebly.com/uploads/1/3/3/9/133997502/5462738.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/gekilolatotasafonolozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382406/normal_5fdaefbfc38ce.pdfIn PDF document text
    • http://gewututikame.getenjoyment.net/building_bye_laws_delhi_2020.pdfIn PDF document text
    • http://ligugiban.scienceontheweb.net/conductor_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493266/normal_602eff544c5b7.pdfIn PDF document text
    • http://konolux.medianewsonline.com/fikepovavowamofozegimab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389816/normal_605fe35612584.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427498/normal_5ff5b570087dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468259/normal_60484327e5a4f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ffe39db-77be-4e0c-a6e4-f4425066059a/the_death_of_ivan_ilyich_and_other_stories_vintage_classics.pdfIn PDF document text
    • http://kibagog.onlinewebshop.net/4775455671.pdfIn PDF document text
    • http://divimere.epizy.com/java_programming_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ad346e3-321d-4ae8-80a1-f21638641e9b/46267329064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b6ac872-8dd1-4800-a56c-b59ca88dc3bf/sony_rx100_i_vs_ii_vs_iii_vs_iv.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_off0000e874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE874 5240 bytes
SHA-256: 8403a757c313464036ccec5cddc4d6b49d883494c9499cc98d4c77d04c976ebc
font_01_sfnt_off0000fa46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA46 10912 bytes
SHA-256: 7a131a64987c1cac19036d8141b9caad89267176f75ff0a56f2d8a5b64095eac

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