Malicious PDF — malware analysis report

Static analysis result for SHA-256 c492165f0d063b20…

MALICIOUS

PDF

81.0 KB Created: 2021-03-03 10:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: dd40e4ac0b0f36468c6e4c838ce3a680 SHA-1: bcd4f5b439a60431351407e950a37f5461344b23 SHA-256: c492165f0d063b20ebf68b5960e77de9c2a2142433eacbaafcdb0754c130afe1
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text fragments that may be part of a lure, and the overall structure suggests it's designed to drive traffic to potentially harmful sites.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=key+west+channel+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481275/normal_6033b8c63d7e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463287/normal_5fe80b6808bf0.pdfIn PDF document text
    • http://pazifelurup.medianewsonline.com/lenosofowureledusanexoki.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/gs3igjx/bulleit_bourbon_whiskey_10_year.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/oigZTgc/purple_and_blue_tie_dye_background.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489042/normal_5ff11a6861cb3.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/Jgdijjc/togoso.pdfIn PDF document text
    • https://cdn.sqhk.co/laruxibut/aijAies/corn_maze_orange_city_iowa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420589/normal_60185cfebbd92.pdfIn PDF document text
    • http://vaxiliwu.medianewsonline.com/howard_leight_impact_sport_bolt_electronic_earmuff.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/fcf9ifp/31466749429.pdfIn PDF document text
    • http://creditstar-kabinet.com/contraception_guidelines_fsrhnitea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403533/normal_6022a5e13e03a.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/skywalker_trampoline_replacement_parts.pdfIn PDF document text
    • http://manuximaxemeje.scienceontheweb.net/bofumilomaretawixus.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/rebomedug/elodea_lab_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/free_weight_loss_eating_plan.pdfIn PDF document text
    • http://wipadafefuxasi.onlinewebshop.net/american_gods_10th_anniversary_audiobook_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/11368840740.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_off00010027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 5268 bytes
SHA-256: 59c6286820be4903d15b062948bf5c57d6e2428166713b3ea88aa0430fcf4e21
font_01_sfnt_off00011236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11236 10704 bytes
SHA-256: 2fbd07cd09065894d596f2b96285dec63412957e76075a035f5f9bf76222edb6

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