Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f90e08c8b17a01f…

MALICIOUS

PDF

75.1 KB Created: 2021-04-22 09:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 68387f681c4674c241195d1169f4fd17 SHA-1: 2d864a7b3da473c80449a53d9bde91a6fe16f9da SHA-256: 4f90e08c8b17a01f64b628e82e8160b1c3c357fb2c218821c172e0a7b86b2639
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, with one prominent URL pointing to 'zajinet.ru', suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for malicious links.

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://zajinet.ru/strik?utm_term=are+greek+and+hebrew+the+same PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378155/normal_6022d2a06880f.pdfIn PDF document text
    • http://milesnires.xyz/symbol_ls4278_programming_barcodesbzveq.pdfIn PDF document text
    • http://scriptbook.xyz/badinerie_bach_sheet_music3ogap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472216/normal_603535143b118.pdfIn PDF document text
    • https://cdn.sqhk.co/xadeviro/igJ6fgf/283960722.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/5llBSjq/30071029523.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/FjbzChg/lego_hidden_side_paranormal_bus_3000_55.pdfIn PDF document text
    • http://mavitrade.com/vowikugazimadetadenebm6vdo.pdfIn PDF document text
    • http://iceteas.space/51631182257s5g74.pdfIn PDF document text
    • http://latuha.com/47741834563x3all.pdfIn PDF document text
    • http://ita-talia.fun/cs_1.6_cd_key_code624aw.pdfIn PDF document text
    • http://ogranicbio.fun/wuzekujelaluvazilxpoob.pdfIn PDF document text
    • http://profmaster74.ru/daralodobedisikegatavadq93g5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://38a589f5-619b-4230-bc7d-f88d9fc6dac5.filesusr.com/ugd/392051_d03adcc35df8460384b572a7ae4f657e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e50d7cf-94d4-47b4-a316-cc4cc7463c21/tuwite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1601cafd-2ddd-4d8e-8e19-9f9e4d293a80/how_to_video_call_on_echo_show_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e31478e6-82a7-45ef-86e9-d368b4ad7056/55400118740.pdfIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_172f237a8ff1415f88312a20c7ba9802.pdf?index=trueIn PDF document text
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_5019005e946c4d7ba0c3dc557ca4acab.pdf?index=trueIn 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_off0000e6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AC 5492 bytes
SHA-256: d013af400cac602acdb271c8ffee393a1c9e41b7984e0915ffe00f4b0fa09a04
font_01_sfnt_off0000f942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF942 11052 bytes
SHA-256: 0e45544133bf60d5ad5cff2fdd3bbfb2a897f00dc2a69572d6b20e764f0c3330

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