Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f079c89455c01a4…

MALICIOUS

PDF

72.0 KB Created: 2021-02-26 11:22:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc013b478e4458490eb4f0a8e39217da SHA-1: d70262430368f6dd64362963b7bb8c500d513331 SHA-256: 8f079c89455c01a4174c1f820c3590c6b59d392293dd349e71924cb2ef9f784e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a page that appears to be a lure for 'ipod shuffle user guide 4th generation'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or redirection mechanism. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/award?keyword=ipod+shuffle+user+guide+4th+generation
    • https://cdn-cms.f-static.net/uploads/4481836/normal_5fd96893825ff.pdf
    • https://cdn-cms.f-static.net/uploads/4483071/normal_602ca5822b53b.pdf
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/zijedopularabuzu.pdf
    • https://static.s123-cdn-static.com/uploads/4422918/normal_6005d03816fe9.pdf
    • https://cdn-cms.f-static.net/uploads/4387815/normal_60292840adf6f.pdf
    • https://static.s123-cdn-static.com/uploads/4450428/normal_5ff7cfea92bcd.pdf
    • https://cdn-cms.f-static.net/uploads/4380682/normal_60331dae21563.pdf
    • https://cdn-cms.f-static.net/uploads/4459470/normal_6022cf26137ca.pdf
    • https://static.s123-cdn-static.com/uploads/4490123/normal_5fcd800d27678.pdf
    • https://static.s123-cdn-static.com/uploads/4459166/normal_5ffea61d90b22.pdf
    • http://zipibafof.iblogger.org/91645953326.pdf
    • https://cdn-cms.f-static.net/uploads/4500893/normal_602d96b12177f.pdf
    • https://forerijekakifur.weebly.com/uploads/1/3/5/4/135401119/66e91f4b0447443.pdf
    • https://cdn-cms.f-static.net/uploads/4460063/normal_6020a7a070bc4.pdf
    • https://cdn-cms.f-static.net/uploads/4380213/normal_60135975bded4.pdf
    • http://thecet.xyz/cuanto_equivale_media_pulgada_en_centimetrosdulzd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zigerakujig.rf.gd/sharp_air_conditioner_replacement_parts.pdf
    • http://fiwipofel.epizy.com/kaxarajoligutinerefopo.pdf
    • http://torunej.epizy.com/dejebediju.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd9b.bin
65209427ec5c63defc34165bfad7f3f46e2f3eaf54ed0f336c7fbaed018af35f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9B 5328 bytes
font_01_sfnt_off0000efbb.bin
b561ca35d9068552baffdc9505a9d955bdef89b733b514bbbab2c1a8690b2b86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 10212 bytes

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