Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a7029d97363d3a…

MALICIOUS

PDF

61.6 KB Created: 2020-11-10 13:48:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bade9c7a534b19b966096b9a5e05d18f SHA-1: 964563e8ff2c076368d889cabe69970cfa16e86e SHA-256: b4a7029d97363d3a36411793bc96482d2adcf62641e2936f7faff0df724efb4e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://traffine.ru/strik?keyword=intermatic+pool+timers+manual PDF link annotation
    • https://xilemizafijoso.weebly.com/uploads/1/3/4/4/134483217/lisuditox.pdfIn PDF document text
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/8444287.pdfIn PDF document text
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/6483416.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/zutilipevozafeguwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413843/normal_5f97529c0b0c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375699/normal_5f9f8e09afb1a.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/xakapudakadu/sumezaximalorosifate.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/evendale_eagles_swim_team.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/wagukif.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/cortland_elementary_school.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/banderas_del_mundo_con_sus_nombres.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_off0000b338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB338 5016 bytes
SHA-256: d84efab3e1ecedc7c8a9bdccec4806cc48979ba3ee043e3c9eaaf40da3a3b5e1
font_01_sfnt_off0000c425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC425 10992 bytes
SHA-256: 3ed75faf459b79f323fc1ba6b547d4f6d802d95a6ff6c9b911e7a47adaf93e42

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