Malicious PDF — malware analysis report

Static analysis result for SHA-256 f784defac971582a…

MALICIOUS

PDF

68.8 KB Created: 2020-11-11 23:24:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a8c49450754d896aa637084a2b35a0a5 SHA-1: 98b5d13464862d6c27cec352461153d7104dd2f9 SHA-256: f784defac971582a4915380c62d3f9e17f70cbb55da8d1e9207f99d5b3cbd9bc
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafffi.ru/strik?utm_term=citra+android+crash+fix PDF link annotation
    • https://zopopalolidipe.weebly.com/uploads/1/3/4/5/134500843/6240835.pdfIn PDF document text
    • https://xizogezoki.weebly.com/uploads/1/3/4/7/134717510/2035770.pdfIn PDF document text
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/burobabimojul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392462/normal_5f8fa630acbff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_5f96e78417343.pdfIn PDF document text
    • https://totapige.weebly.com/uploads/1/3/1/4/131483287/559a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fofeguj/moonglow_chabon.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/gikegurujedodavogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a203ef14-58e3-4278-b72b-11a870506cf3/befufizefadivovub.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/mitusikixujugemalebupexu.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/dobazujoxiwevasedawu.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/calculus_11th_edition_larson_download_free.pdfIn 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_off0000d10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10D 5048 bytes
SHA-256: 500ca87a40ded741afd128828094f47bc3191218561200c3ab03229c9aef38af
font_01_sfnt_off0000e231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE231 10688 bytes
SHA-256: db75b4350c80183f4072293f552ac182789f49c1af2927ec7885fe2def56206b