Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ebfcf8da9d38ff3…

MALICIOUS

PDF

63.9 KB Created: 2021-02-02 21:12:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 956a9fd5b336c4517b0131f24515a3c5 SHA-1: 3fbc97f4ea2149d13e7e1ec7875a27ead963add4 SHA-256: 6ebfcf8da9d38ff361e03a9d49547d2bcc310310fdbe0544a2f36d84b69801a0
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a malicious redirector. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of external links, suggesting an attempt to drive traffic to various sites. ClamAV detection and ML classification confirm the malicious nature, likely related to phishing or malware distribution via these links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=presto+bread+slicing+guide+model+08615 In PDF document text
    • https://cdn.sqhk.co/mugapowejog/gjmgggj/wakak.pdfIn PDF document text
    • http://trenketo.buzz/tapagorovuzonexenagap0rl4y.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/gQMggPS/texas_longhorns_scores_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/fafegatoko/jeyidPt/i_love_you_ringtone_telugu_mp3_download.pdfIn PDF document text
    • http://ses-paypal.com/46755255367vgvzf.pdfIn PDF document text
    • https://cdn.sqhk.co/luvuxokam/jdidIke/bosupotidibogugom.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/iiihiij/dragon_ball_advanced_adventure_download_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xexanodu/Lgeha04/50966503828.pdfIn PDF document text
    • http://bionatur.space/4009687018hivds.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/HiZhbha/vapalozanid.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/pidovojutexegeredon.pdfIn PDF document text
    • https://moduruwili.weebly.com/uploads/1/3/2/7/132710657/2196236.pdfIn PDF document text
    • https://cdn.sqhk.co/zafupusapun/fbDiajf/jizukomixufej.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/cvhajb3/three_kingdoms_massive_war_best_general.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/CgjFjh0/switzerland_flag_png.pdfIn PDF document text
    • https://cdn.sqhk.co/vagewovupug/WhaCm5G/42544159214.pdfIn PDF document text
    • https://cdn.sqhk.co/bibilofefi/pTcUhjT/75626868571.pdfIn PDF document text
    • https://lasapiboxemifol.weebly.com/uploads/1/3/4/8/134865682/d76d9b3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ba22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA22 6068 bytes
SHA-256: 3a42f31a85a62c5f5f7c8cd9e1c8a78c5ae2658be8e6723de4b2680971f40694
font_01_sfnt_off0000ceb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB0 10476 bytes
SHA-256: a8b0402e8935fbece413d3f3ee7be057144841e05068ddd83738cc2c2669562e

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