Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ffc1dbe09afb47…

MALICIOUS

PDF

83.3 KB Created: 2021-03-15 15:08:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66e0695fb77c91c2040a99490f35b0cc SHA-1: d54b0ab0f4c12ecda5fed73581d66d9e58d09140 SHA-256: 79ffc1dbe09afb47853622c9b401bb08555f13605782c1f7ace8969694c5e1f7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a mass of external links, with one prominent link pointing to 'zajinet.ru', suggesting a phishing or redirection attempt. Although no scripts were extracted, the presence of numerous external links and the PDF's structure strongly suggest it's designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=anet+a8+3d+printer+assembly+instructions
    • https://dukowitemodilel.weebly.com/uploads/1/3/5/3/135316140/1595496.pdf
    • https://static.s123-cdn-static.com/uploads/4371010/normal_5fff93ef04978.pdf
    • https://cdn-cms.f-static.net/uploads/4426556/normal_6020fa58c95e9.pdf
    • https://cdn-cms.f-static.net/uploads/4464732/normal_5fd7cbea3e218.pdf
    • https://cdn-cms.f-static.net/uploads/4486192/normal_602a587213fd8.pdf
    • https://fosegeluka.weebly.com/uploads/1/3/4/7/134717840/459651.pdf
    • https://nazoturifebigik.weebly.com/uploads/1/3/1/6/131606271/sokevezex.pdf
    • https://lukogazusewof.weebly.com/uploads/1/3/4/6/134643336/eee18bf5f11b666.pdf
    • https://dixodenifafazud.weebly.com/uploads/1/3/1/8/131856669/vaxodobuzopebas-vokuz-pudurudurovo.pdf
    • https://static.s123-cdn-static.com/uploads/4450438/normal_6000b0d1dca7f.pdf
    • https://cdn-cms.f-static.net/uploads/4366982/normal_6011dbf57f58f.pdf
    • https://cdn-cms.f-static.net/uploads/4484399/normal_5fd897be1ff65.pdf
    • https://cdn-cms.f-static.net/uploads/4379054/normal_603bf866d6c04.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kibavutibeved/cervical_spondylosis_physiotherapy.pdf
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_d50e2dd703f54615a29cc8708509c1d8.pdf?index=true
    • https://s3.amazonaws.com/xilasisefi/jubivosopotimek.pdf
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_0e88fb335ad9423191794de3bd8592dc.pdf?index=true
    • https://s3.amazonaws.com/silubebebefuju/alpine_v_power_mrp-m500_price.pdf
    • https://9f61dd91-ea7e-4edc-a837-c43fae5dccfb.filesusr.com/ugd/ed897c_85380f7e496d4c1e8b7426d88ff7bad9.pdf?index=true
    • https://s3.amazonaws.com/fusopoxipo/nigomidasoze.pdf
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_328114e9edc441928cb3b2a568e78f74.pdf?index=true
    • 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_off000106e3.bin
119dba7af03d671391fef2856212844d4b8474154dc819eba1b8d1a9de6b6b43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106E3 5808 bytes
font_01_sfnt_off00011a96.bin
04c848b5d69dc331b7925b8c266d463034ceee39b1bf808f68d2c0bef0b76960		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A96 10820 bytes

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