Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b52892c638e86a2…

MALICIOUS

PDF

68.3 KB Created: 2020-11-11 05:28:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 475b452dcc08312ecdc0f7790da8017f SHA-1: 16d263f9fbe977f9a1a9c5a792ee07dde6635eb5 SHA-256: 6b52892c638e86a2dffd1f4bfa5a1f3c2c2d4eff920d4db44ee721c011df21f2
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 0.9997

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/123?keyword=download+ti+83+online+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380682/normal_5f8aef2c2614a.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/domumewabibanuj_wufifi_riwufop_bozulodezij.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/livivuvuwugeb/bitter_harvest_ann_rule.pdfIn PDF document text
    • https://s3.amazonaws.com/xedobox/dasinuvaruligojuvi.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/sezaxodugalobokivilam.pdfIn PDF document text
    • https://s3.amazonaws.com/zokokamu/piano_chords_and_lyrics_for_gospel_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4564766-57a9-4677-9999-ab1bd643d4e5/sojazevulazepazamoxagu.pdfIn PDF document text
    • https://s3.amazonaws.com/luresimosip/wimafovekixa.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/vijuxapuj.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/taiwan_railway_map.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/longaberger_retired_basket_price_guide.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_off0000cfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC1 5172 bytes
SHA-256: 17b6c134b664ae8d31cd5c6bdd7ef0a2dbc82bb8deb552dde8e2a2f6bccb8075
font_01_sfnt_off0000e188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE188 10212 bytes
SHA-256: ae1598b608b8373ecf68caca1aee4a51c678928ac85a30f71f3add27ef625157