Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3d5aa137d22cab…

MALICIOUS

PDF

77.3 KB Created: 2021-01-13 16:05:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f5afbd8b7f819c09f79982bec1bedb3e SHA-1: 5c92f7a3ac0040fd725b3b2290714aa516da0600 SHA-256: 3f3d5aa137d22cab03b1ea9734639a1b87f1ce98b6e8bb2a07e17384abb69af3
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to disposable domains and Weebly-hosted files, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to its creation, including the authoring application and date, but does not provide explicit instructions. The presence of external URIs and the overall structure strongly suggest an attempt to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/aws?utm_term=academic+writing+exercises+with+answers+pdf PDF link annotation
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/navotizuma.pdfIn PDF document text
    • https://nipibodofabujid.weebly.com/uploads/1/3/4/2/134265940/325125.pdfIn PDF document text
    • https://kefexogutifega.weebly.com/uploads/1/3/5/3/135309882/fogonawulufuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488349/normal_5fb3657a93740.pdfIn PDF document text
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/7370981.pdfIn PDF document text
    • https://lumovomudin.weebly.com/uploads/1/3/4/7/134704265/xovusato_nilekatagogutu_wasukemo_worakepum.pdfIn PDF document text
    • https://site-1174138.mozfiles.com/files/1174138/diwiwozejizepewus.pdfIn PDF document text
    • https://negapisege.weebly.com/uploads/1/3/4/6/134635707/rijajibatig-gajotagonaxoz.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/difapazarevos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369190/normal_5f9e1aa31edc1.pdfIn PDF document text
    • https://site-1172317.mozfiles.com/files/1172317/xanizimowo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382420/normal_5fa621c36a413.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416321/normal_5ff6779cb11c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415308/normal_5ff47dc3e94ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/39582427907.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/munojopamigudixebuvafa.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_off0000ef1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1E 5688 bytes
SHA-256: 33cecd242d7bfb0094f72de1efae51e6051b67e22b6757647e444b033c4a0627
font_01_sfnt_off00010265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 11032 bytes
SHA-256: 78beeccaacf1352421af81ea6490dee2a6201cc328552739ddd232284677c200

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