Malicious PDF — malware analysis report

Static analysis result for SHA-256 970f6c0a27b445b7…

MALICIOUS

PDF

82.8 KB Created: 2021-03-08 17:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 005ad27bd43e45d68c4e944b3db1c799 SHA-1: ad1c91dadd43e3a00c3f75d427f6971be393f7a4 SHA-256: 970f6c0a27b445b7e41b9167acf9670b613f7c0206061a54d14becb8bbf00daa
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a prominent one pointing to 'pelibifir.ru' and another to 'natlab.ru'. Heuristics indicate the PDF is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing a trojan.

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://pelibifir.ru/123?utm_term=wallpaper+madrid+city+guide
    • http://natlab.ru/53753111821m5vp.pdf
    • https://bupedokan.weebly.com/uploads/1/3/1/6/131607930/pokimatufu.pdf
    • https://kodirovotosin.weebly.com/uploads/1/3/2/8/132814250/bdde5.pdf
    • https://matamelo.weebly.com/uploads/1/3/1/3/131384575/4936281.pdf
    • https://cdn-cms.f-static.net/uploads/4467032/normal_601046874baed.pdf
    • https://static.s123-cdn-static.com/uploads/4401555/normal_5fdeafbdf2e23.pdf
    • https://cdn-cms.f-static.net/uploads/4466376/normal_60268641254e6.pdf
    • https://xufodikufidu.weebly.com/uploads/1/3/5/3/135382923/2203648.pdf
    • http://timelessdecorum.com/movie_3_the_last_wizard_of_the_centuryz010k.pdf
    • https://nitavadokeja.weebly.com/uploads/1/3/1/1/131163909/bd6baacb1.pdf
    • https://cdn-cms.f-static.net/uploads/4380530/normal_603534720c9fa.pdf
    • http://tixshopclub.space/topism3ikd.pdf
    • https://fojefutitamok.weebly.com/uploads/1/3/3/9/133989463/95c3ad5a9.pdf
    • https://senidexug.weebly.com/uploads/1/3/0/7/130775540/2768586.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_c0a8303ba41e4ce4b371052efd387a44.pdf?index=true
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_0c6d7e35797141f5bc05c510cbec4649.pdf?index=true
    • https://uploads.strikinglycdn.com/files/843373c4-82ad-4b9b-a088-f49274582cba/barcharts_quickstudy.pdf
    • https://uploads.strikinglycdn.com/files/b4698125-78cb-4790-9c9e-f20dbee51a8e/how_to_sell_arbitrage_on_amazon.pdf
    • https://uploads.strikinglycdn.com/files/06ed8fd6-8fe1-4c20-bcbe-12b45f029885/2007_toyota_yaris_sedan_yrs_for_sale_california.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_off0001007a.bin
4b79e4ef6d0f42238ca983843e67cc2bd1523245bb8954d4f38df353f9bc48b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1007A 5328 bytes
font_01_sfnt_off00011298.bin
4117efd34d3da9d3609118f563b0ec491822008ffc186435d6756ff3094a778e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11298 13136 bytes

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