Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ed65df14573c51…

MALICIOUS

PDF

65.2 KB Created: 2020-12-28 09:06:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 870dcdfaaab91203f5eaf239c214ec22 SHA-1: 753dc8c455143fe4192f42e4c3771caf96fd631e SHA-256: 79ed65df14573c51ec2ee324842b225d459f4f19ada6d01529391c8c15329e8c
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a link to a known malicious redirector and a large number of external PDF links, suggesting a link farm for SEO manipulation or malware distribution. The ML classifier also strongly indicated maliciousness. The embedded URLs and the nature of the heuristics point towards a phishing or malware delivery attempt, likely using the document content as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=context+diagram+visio+template In PDF document text
    • https://cdn.sqhk.co/vekudaselux/fhfiiha/87468274027.pdfIn PDF document text
    • https://cdn.sqhk.co/toralapiluw/hFWUShc/amc_24_orange_park_mall_movie_times.pdfIn PDF document text
    • https://pilogowizimofog.weebly.com/uploads/1/3/4/6/134604263/7266885.pdfIn PDF document text
    • https://cdn.sqhk.co/karapazepot/jgicX7B/best_5._1_sound_effect_movies.pdfIn PDF document text
    • https://guxedujigizos.weebly.com/uploads/1/3/4/7/134735137/waxujiniparula.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/be26c422-1f8f-45ad-9c6c-636797b1dcba/87552582123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77dbaed3-5a9b-4428-b00b-45f38e1a51ce/average_naked_women.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1eafdca-6157-458c-ba3e-89a0ef435ee3/mosquito_magnet_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8e9e591-db46-45d1-a982-b3f6db821ded/48744375349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24343006-830e-4f58-8505-727177a5f09d/homedics_humidifier_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07087c4d-0f6c-4027-bb96-95d1d02fca77/instagram_captions_for_guys.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85fc9153-1da7-473d-b18f-2eb2842fa206/muzixonilavali.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_off0000c1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F9 5312 bytes
SHA-256: 7b5861e53cbec081738520ca652b89b63c2a2abfbb3f2b0294c5f016be02100b
font_01_sfnt_off0000d3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FB 10192 bytes
SHA-256: 0cb280f6a9fc80d1c8bab34931a25c0bfc2604161ee6f214e6c4d94cc080a7a0

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