Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c948522e3b734c6…

MALICIOUS

PDF

79.6 KB Created: 2021-04-28 02:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f9a140ff1475521f0cd87bd5885a4b3 SHA-1: 277fc889d314bbc2dc57666d2fbfc256c517c88a SHA-256: 3c948522e3b734c643aa6e5d413241bea0fcb2cad7c9ff0bba385c06a596b121
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO poisoning or phishing attacks to direct users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a large number of external links within a small PDF, suggesting an attempt to manipulate search engine results or distribute malware. The ClamAV detection and ML classifier also strongly indicate malicious intent, likely related to phishing or trojan distribution.

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://kuzutuzo.ru/strik?utm_term=harry+potter+book+series+hardback
    • https://static.s123-cdn-static.com/uploads/4446489/normal_5fcb6ae9bcae4.pdf
    • http://manthoughtswebsite.website/closer_patrick_marber_analysisneubr.pdf
    • https://static.s123-cdn-static.com/uploads/4465538/normal_5fcce506c4ed1.pdf
    • https://jovimujokuva.weebly.com/uploads/1/3/2/6/132695493/dakuxovebirit-pisevusunu-bijixix-fobaxumuju.pdf
    • https://motisodufar.weebly.com/uploads/1/3/5/4/135400919/daxugop-wesifafulejo.pdf
    • http://file-id.ru/108668795628jfoj.pdf
    • http://yildirimotobursa.com/kenmore_elite_he3t_washer_specs60uyy.pdf
    • https://bobazuforabi.weebly.com/uploads/1/3/1/4/131452976/gabazubamoxod_lasovetinebesib_viguvuxenu_xefejogilarozi.pdf
    • https://zufuleruzu.weebly.com/uploads/1/3/1/6/131637307/564659.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_e60f98ef5225446abfa60b148523f7f1.pdf?index=true
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_eb15ba70d4d64807946463354d5148dc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0edbb31f-81f3-49c4-8d20-f9151cea25c6/pupovukukaxoluvemod.pdf
    • https://uploads.strikinglycdn.com/files/f07f4af4-0aaf-4391-b49c-d1aca938f6ec/tractor_supply_cannon_safe_review.pdf
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_db9d863b672c4c32882366da3b751d29.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5ef14d66-610e-404f-8e19-541010c89fee/summer_infant_video_monitor_setup.pdf
    • https://uploads.strikinglycdn.com/files/5f6dbe53-b969-4277-96b1-bfa4e5f9ce1d/33185397036.pdf
    • https://176fe727-baa2-4f6f-8ab0-cddcd97ecb74.filesusr.com/ugd/45df28_2ffea0870fb1463f9c5960c69f558b0c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/03e82a95-8f9a-44c6-80ca-2ba09c32a87d/9530738192.pdf
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_227821b083ff4a65bfd953f500b37a89.pdf?index=true
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_4e36b15386e5406381c3b579259b7f4f.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_off0000fa75.bin
ccb0148c4b924b17a5986f6d11e634932b0e3a4137c562c2385d7de46611dbe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA75 5396 bytes
font_01_sfnt_off00010cc7.bin
b9917037f25cb4e0034a8f16bd34853b9f9dfbd1a83cee5d10768542c2336320		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC7 10840 bytes

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