Malicious PDF — malware analysis report

Static analysis result for SHA-256 b246df798a6ef526…

MALICIOUS

PDF

74.5 KB Created: 2021-02-04 08:02:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c3e0b13e2cf038db1e2a075deb7a13b2 SHA-1: 974c0cca6d225c6468916ee187543c4d35903302 SHA-256: b246df798a6ef526db267683af23fdbb31e439e306ff6c8444231e1b59bf382a
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting it's designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains metadata related to 'Pa hunting seasons 2015 16' and the authoring application, which are likely decoys.

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://jacksth.ru/123?utm_term=pa+hunting+seasons+2015+16 PDF link annotation
    • https://jifalutisapore.weebly.com/uploads/1/3/4/7/134772579/zagevav.pdfIn PDF document text
    • http://xtreme-sport.ru/781113832299pivt.pdfIn PDF document text
    • https://sevimuxeso.weebly.com/uploads/1/3/0/7/130739978/4922111.pdfIn PDF document text
    • https://kusuxifitumaka.weebly.com/uploads/1/3/4/5/134593182/e22d9d0c.pdfIn PDF document text
    • https://botiwugagow.weebly.com/uploads/1/3/1/8/131872238/8149822.pdfIn PDF document text
    • http://instapriz.website/3095558086g4j72.pdfIn PDF document text
    • http://insurancesouk.com/velas_japonesas_libromkjaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402504/normal_5fcae82f90b99.pdfIn PDF document text
    • https://vunozeguwogiwe.weebly.com/uploads/1/3/4/7/134745761/datuzavaveg-vewenegevugoxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448724/normal_5ff3fc530d4f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366040/normal_6001db57838c4.pdfIn PDF document text
    • http://hookup668.site/loximivodetitijojub0l3lg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418566/normal_5feb78489f9d9.pdfIn PDF document text
    • https://gitumakiwu.weebly.com/uploads/1/3/1/4/131437138/derolo.pdfIn PDF document text
    • http://mebets.xyz/factoring_by_grouping_worksheet_answershltql.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450419/normal_600a57f79cb36.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://musepojomu.rf.gd/joruvivababogu.pdfIn PDF document text
    • http://dufazovuko.epizy.com/68595583585.pdfIn PDF document text
    • http://gasanilu.epizy.com/38537119315.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_off0000e5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F5 5424 bytes
SHA-256: 1baf1c5849c27ac8452ff299c7af2e49b1c81dd9f7799272fcd6d86ccc110db5
font_01_sfnt_off0000f874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF874 10744 bytes
SHA-256: 34110c50c535ec425fd53e7169417dedf1adf86a543c2ef7a3b0ecbb4b8f4d15

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