Malicious PDF — malware analysis report

Static analysis result for SHA-256 76494ae1cc11b200…

MALICIOUS

PDF

75.2 KB Created: 2021-04-23 16:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 09cee97763423521994d23c7d60b49a8 SHA-1: 233b5f1aafcec543a2103895ac9bd02b8f78224e SHA-256: 76494ae1cc11b2004fbfb5d27b7dcd9e5f88e275aa601ee74c00c15ddc052f28
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate the PDF is designed as a link farm on disposable hosting, aiming to direct users to potentially harmful sites. While no scripts were extracted, the overall structure and link analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=how+did+christianity+start In PDF document text
    • http://xedeporib.medianewsonline.com/bunetozopege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375503/normal_602a9ebd7479e.pdfIn PDF document text
    • http://xupenirulavep.iblogger.org/29619316657.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460946/normal_60498b8b32b0e.pdfIn PDF document text
    • http://pasadurasasagi.medianewsonline.com/rajilafatibedonikaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_6037d84de4d92.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/xatanuganaweragabatuzisa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dolanuvusipegu.myartsonline.com/casio_g_shock_mudman_g9000_review.pdfIn PDF document text
    • http://bibujilapewe.epizy.com/bandsaw_box_designs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a77cd053-ec21-4237-820d-fee51f3290ca/dr_heideggers_experiment_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/juwojisifiworomudi.pdfIn PDF document text
    • http://lojifasipok.rf.gd/td_atomistique_corrig_s1.pdfIn PDF document text
    • http://mafixatoje.epizy.com/fmla_guidelines_wa_state.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1678f120-5def-432c-a82e-ed4e749acb31/what_does_error_code_f10_mean_on_kenmore_stove.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/us_fda_gmp_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/holmes_ultrasonic_cylinder_humidifier_hm411-btu-fca_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/totaline_thermostat_red_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7626f25f-f63d-42fe-bf57-c1ffa6d0e046/32824368301.pdfIn PDF document text
    • http://sefowolo.atwebpages.com/52492583512.pdfIn PDF document text
    • http://gogolozumer.epizy.com/bittorrent_software_for_pc.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_off0000e87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 5152 bytes
SHA-256: 2195520fa951651f8d512da9b8302c1727c3ea1b72bc9181cb1caa574eac63de
font_01_sfnt_off0000fa10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA10 11016 bytes
SHA-256: dca0449b341cecbcffacce38c009d5e8ffd1fa40dea28e2f186b3bc65068af7e

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