Malicious PDF — malware analysis report

Static analysis result for SHA-256 a879109d854dd551…

MALICIOUS

PDF

62.6 KB Created: 2020-12-20 13:02:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d2b9f0ac399814a8d3db7943108b166 SHA-1: 79452f27d156d02421d41352d29a7dec18daa0fd SHA-256: a879109d854dd551fe5ba05a10edef403f4632dcdf1df127c7af95cd40e298fc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The PDF contains a large number of external links, indicating a link farm or redirection scheme designed to lead users to potentially harmful websites. The presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's primary purpose is to drive traffic to these external resources.

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://trafffe.ru/strik?utm_term=pavement+slanted+and+enchanted+discogs
    • https://solugukaxazazo.weebly.com/uploads/1/3/4/7/134748989/40331f0a15254e1.pdf
    • https://sudewivozuv.weebly.com/uploads/1/3/2/3/132303071/3636303.pdf
    • https://cdn-cms.f-static.net/uploads/4378378/normal_5f9016a150050.pdf
    • https://nemegadixutore.weebly.com/uploads/1/3/4/6/134689972/farup_gowoboveviga_guguxu_tosuletixopigaz.pdf
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/lilufese.pdf
    • https://zepitobazelaki.weebly.com/uploads/1/3/4/6/134619491/2020364cd9.pdf
    • https://kutowovazamil.weebly.com/uploads/1/3/4/3/134362820/7397318.pdf
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/3409757.pdf
    • https://cdn-cms.f-static.net/uploads/4370275/normal_5f8ced1332a5b.pdf
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/gipij.pdf
    • https://cdn-cms.f-static.net/uploads/4403816/normal_5f923c9f63569.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fisulefajow/cyanogenmod_installer_para_android_apk.pdf
    • https://s3.amazonaws.com/wizidimawag/notadipedawezexuram.pdf
    • https://s3.amazonaws.com/dudurat/pumegugerixet.pdf
    • https://s3.amazonaws.com/zugutixe/48711274518.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_off0000b7f1.bin
ca1f629857ea978ec0e6f429b60ef27b3be225f919c95ccd22a5cbca90421e45
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F1 5316 bytes
font_01_sfnt_off0000c9e9.bin
d086b4d511dd83ba3d0ad5ddd3850d8bc5ff05e30fc71463397b3f87e9523bb7
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E9 10360 bytes