Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f437822c508ee61…

MALICIOUS

PDF

65.9 KB Created: 2020-11-26 00:06:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 816ab16ec054faf1279979a7fe311078 SHA-1: 7124ad874d612ab10968ce7c66c475dbea2ba403 SHA-256: 8f437822c508ee610371d2266dde239fa39aacc5de6ad8513d44e249083956b0
214 Risk Score

Malware Insights

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

This PDF file contains embedded links, one of which points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain text related to a product sale, likely serving as a lure. The presence of multiple external PDF links suggests a link farm or redirection scheme designed to obscure the final malicious destination.

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://traffmen.ru/strik?utm_term=cycleops+bike+trainer+for+sale In PDF document text
    • https://cdn-cms.f-static.net/uploads/4497638/normal_5fbed3ec37e00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387817/normal_5fa2b49442fa0.pdfIn PDF document text
    • https://maraduwiz.weebly.com/uploads/1/3/4/3/134363873/853fc651867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373768/normal_5f944f7b5bf6c.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/279d33e4-d1b9-44e3-b7f5-56ad51d33cf1/lixixisovajejorax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd775f07-0057-4387-baad-e34228457168/hold_the_door_meme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad895964-de22-49e9-bb16-dc5002970af0/fallout_4_out_of_the_fire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17273290-f134-4959-8eaa-4d32b08a5eb1/ffxi_samurai_guide_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/756c5e4b-d75f-49b0-a3ee-70ed12e5d2e8/exteroreceptores_de_la_piel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd300cd5-c39b-483b-9304-f651880f502b/watch_free_amazing_spider_man_in_2012_online.pdfIn PDF document text
    • https://s3.amazonaws.com/xatojem/within_subjects_design_definition_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2635fa28-1e1e-4e5c-b217-b9812a495cdf/827655688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad2f5cdc-8e54-42db-b38e-3c413be90b6e/riwujij.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_off0000c4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DC 5220 bytes
SHA-256: cddf8950e6a7c927b077adcb18ca673d17d31edf0c96fbbf2a5056ca09cb8bdc
font_01_sfnt_off0000d6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B7 10664 bytes
SHA-256: cbebe10a745bbcb748f1cb8f01d3c6daf7c20301293caf42dbc429c4207a8201

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