Malicious PDF — malware analysis report

Static analysis result for SHA-256 0321d562e62b62db…

MALICIOUS

PDF

68.0 KB Created: 2021-01-08 08:11:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ad6f1f2c42834c9f1206d8c7be447328 SHA-1: 021bed881338f95a8ad970a2955433d38cea54c2 SHA-256: 0321d562e62b62db5efdbb8d28b0e402c22e61eab424b27b82c4c8cd2155b031
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are part of a link farm designed to manipulate search engine results. One critical heuristic indicates that a link points to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or to distribute further malware. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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://gettraff.ru/aws?utm_term=free+wedding+border+templates+for+microsoft+word In PDF document text
    • https://najutumivuzobo.weebly.com/uploads/1/3/4/4/134473994/3493077.pdfIn PDF document text
    • https://buxiwizekekaxe.weebly.com/uploads/1/3/4/6/134662233/mamakopelerulinasowo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f9683c8dfded.pdfIn PDF document text
    • https://tarimewisu.weebly.com/uploads/1/3/0/7/130739021/subopamesibutefit.pdfIn PDF document text
    • https://jimazakogise.weebly.com/uploads/1/3/4/6/134612968/5943402.pdfIn PDF document text
    • https://mozosuroje.weebly.com/uploads/1/3/4/4/134456199/nosifitenenuxadubib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_5f872b064dcff.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/sorapobuk/camp_lejeune_mcx_uniform_shop.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/7756031809.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/bloomberg_l._p._annual_report_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37936763-c8a1-47e4-9622-b2f99f7b8287/43148916239.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/odia_new_song_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/62098862738.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_off0000cbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFE 5664 bytes
SHA-256: 013fb41419e535bba50b073e609eac98796209b8e78511356f3f0607be54ebe3
font_01_sfnt_off0000df38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF38 10512 bytes
SHA-256: 6803f7b0799977adcd5ce364303232bae4bc300a81f3139ab80c173b3e0cc15c

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