Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c81e56150bbec04…

MALICIOUS

PDF

83.9 KB Created: 2021-05-18 07:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 83fb63764795f003fc7a35c86d3e09f4 SHA-1: ebb2e50f329637b9c83f4821b29e744cbea05d2b SHA-256: 8c81e56150bbec046920dfedc4487ad9c651a0716f0a05b95917b04ad4d2dd47
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL, 'https://zajinet.ru/strik?utm_term=tres+veces+t%25C3%25BA+pelicula+completa+2019+descargar+gratis', appears to be a lure for users seeking movie downloads. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://zajinet.ru/strik?utm_term=tres+veces+t%25C3%25BA+pelicula+completa+2019+descargar+gratis PDF link annotation
    • https://vavuvulo.weebly.com/uploads/1/3/2/8/132814906/9e87f4897287.pdfIn PDF document text
    • https://sikufotoxatufik.weebly.com/uploads/1/3/4/4/134458503/6682989.pdfIn PDF document text
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/nuxolomapuraxedim.pdfIn PDF document text
    • https://biwamuneluzotip.weebly.com/uploads/1/3/2/6/132696598/dubagapepariwa.pdfIn PDF document text
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/gokolebaki_dalulu_kozuzidoguvug_damutam.pdfIn PDF document text
    • https://xalemewo.weebly.com/uploads/1/3/4/6/134665704/fonovuv-gugatim.pdfIn PDF document text
    • https://posonapajisosi.weebly.com/uploads/1/3/4/1/134108616/nufafasa.pdfIn PDF document text
    • https://kutenamig.weebly.com/uploads/1/3/0/7/130740069/sapikik.pdfIn PDF document text
    • https://tukowozurowogof.weebly.com/uploads/1/3/4/4/134440104/0e4616d36ac4.pdfIn PDF document text
    • https://pusurezifokuni.weebly.com/uploads/1/3/4/3/134317864/3711452.pdfIn PDF document text
    • https://nasabera.weebly.com/uploads/1/3/4/4/134447265/31637c91c28b79.pdfIn PDF document text
    • https://nivirijimukavut.weebly.com/uploads/1/3/2/6/132681164/papusizuzazusula.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lowepasonadoji.rf.gd/fuzukogorekaxomux.pdfIn PDF document text
    • http://gugujis.epizy.com/australian_healthy_food_guide_portion_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e50aac4-c6b8-4e3b-9d1c-ec01aa4e85ba/what_does_non_thermal_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6500b72-8906-445e-ae25-4c2eaf3b94d0/how_to_change_name_on_drivers_license_after_marriage_maryland.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3772392-4dad-4a95-ad09-f3ba1101568a/nesivugijuvegasaxivijiwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d36cb462-14aa-4fac-ba6f-1e898826dbc6/tojitunuvopewojutener.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b983b789-cb8b-43c2-86ee-06c7bcb41996/55276863260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/307c3921-154a-4978-8946-6b29d42cd7e5/i_am_a_man_chicago_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/422308e9-0a61-47ce-adad-c6b71dead167/balonimowitar.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF16 6000 bytes
SHA-256: f34073ffa43093fd99e88e6e0e82df90c7ec0a774e3a12e80098b9e103862037
font_01_sfnt_off0000f33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33E 3464 bytes
SHA-256: 57414a0b232f5a6b65bcdbc5ec6787d84879cdaa7d7e5d6ae532ec26b3041e6c
font_02_sfnt_off000100ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 12912 bytes
SHA-256: 9b5e86f0bb6f59ce475ca0ffd001022236d2890eabfa082388f30fdbe7109334
font_03_sfnt_off00012865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12865 16324 bytes
SHA-256: d5e1f39ccaead822403ee000f6486140f3e4ccdab25b3409edda9415d859c3be

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