Malicious PDF — malware analysis report

Static analysis result for SHA-256 c384bf39e37bf186…

MALICIOUS

PDF

78.9 KB Created: 2021-05-21 05:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9e1a8248fb34a6fe7b0823aa2ffb69cc SHA-1: e7f7249565c270e2383b213d6329023403615d88 SHA-256: c384bf39e37bf186edb574dec9017a0cc0f44c0effe1c1be5894c4e9a5b21ada
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly and other hosting services, indicative of a link farm or SEO abuse. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a phishing or trojan payload. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gimoguvi.ru/strik?utm_term=thermodynamics+holman+pdf+free+download PDF link annotation
    • https://vobudogekatobef.weebly.com/uploads/1/3/0/8/130874620/4ef46f466ff793.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380523/normal_6062de62933c2.pdfIn PDF document text
    • https://fisokifife.weebly.com/uploads/1/3/4/3/134340906/fibusowiru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465006/normal_606640c3b8995.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380383/normal_5ffba07f99537.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455375/normal_600a47902e194.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403410/normal_5fe2760727ec5.pdfIn PDF document text
    • https://xoxopazivufa.weebly.com/uploads/1/3/5/3/135398299/dovotel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413374/normal_5fe8151dae53f.pdfIn PDF document text
    • https://vanuludegevu.weebly.com/uploads/1/3/0/7/130776818/6148622.pdfIn PDF document text
    • https://budojidotepaso.weebly.com/uploads/1/3/5/3/135312143/zubuza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387701/normal_60235810e18ae.pdfIn PDF document text
    • https://risibazizugati.weebly.com/uploads/1/3/4/7/134710005/nulurabekokip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nagev/properties_of_nanomaterials.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/21491353991.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/apocalipsis_14_6_lldm.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/samsung_refrigerator_rs265tdrs_not_cooling.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/92558916396.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/6304119771.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/gulobudawud.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE843 5244 bytes
SHA-256: a126e88e78b94f8299169ab0a96a365287ca55be1cb5aad390e776f00978a3de
font_01_sfnt_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 11280 bytes
SHA-256: dded2d5df9dd873513dd233ce1f56d85768300a79cf684d0c63a3aeb51c7c721
font_02_sfnt_off00012051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12051 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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