Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3292f79663fd5da…

MALICIOUS

PDF

71.8 KB Created: 2020-12-17 12:21:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d84b1be7cf8ba474762a48cd573c9ec SHA-1: 14997fce0573b32de9e8f714102ddf54bc2a36de SHA-256: e3292f79663fd5daf86b24ea5e272ebc130eb299e25bf25aeb9d6b7013dab867
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier also indicate maliciousness. While no scripts were directly extracted, the presence of numerous external URLs points towards a malicious intent to redirect users to potentially harmful sites.

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://traffking.ru/strik?utm_term=elbert+frank+cox+early+life
    • https://wesofozuxo.weebly.com/uploads/1/3/4/2/134266961/visilap_rabipefas.pdf
    • https://cdn-cms.f-static.net/uploads/4412154/normal_5f9e04844fdd8.pdf
    • https://sopoxovolofu.weebly.com/uploads/1/3/4/5/134509961/mevurovute_zufidutitot_pigekosusagilas.pdf
    • https://zesukixugedun.weebly.com/uploads/1/3/4/5/134593530/1586641.pdf
    • https://cdn-cms.f-static.net/uploads/4385880/normal_5fd93d67711d7.pdf
    • https://tivexafo.weebly.com/uploads/1/3/4/3/134348633/ruvone.pdf
    • https://cdn-cms.f-static.net/uploads/4391649/normal_5f9494059ca06.pdf
    • https://xijonezamo.weebly.com/uploads/1/3/1/4/131407630/nuninexitixip.pdf
    • https://kanolapegagidil.weebly.com/uploads/1/3/4/3/134339460/rafimuzawi_zifetubibawiwi.pdf
    • https://cdn-cms.f-static.net/uploads/4371783/normal_5f8e1710086a4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/2e06a9de-b88f-4fdf-9136-114a0d540671/tag_heuer_formula_1_manual_winding.pdf
    • https://uploads.strikinglycdn.com/files/3a461ecf-b556-46a3-b864-a894f62103ef/37745532653.pdf
    • https://uploads.strikinglycdn.com/files/2726e8d3-fcaf-463b-a286-11404e5f690d/stearic_acid_freezing_point.pdf
    • https://s3.amazonaws.com/ninazarila/bigness_project.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ced9.bin
b57deafd064a6b6810a35c674216cc67e3c7379d2af58c333d07a3ed77b6012d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCED9 4816 bytes
font_01_sfnt_off0000df4a.bin
96b1ac520b4e2b1a60c1d5cab229de2efd3537d540319a578a525212b109a0fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4A 10836 bytes
font_02_sfnt_off00010420.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10420 4324 bytes

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