Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc92fb3f27b34b09…

MALICIOUS

PDF

70.4 KB Created: 2021-03-29 17:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3a2c9db7baccb5fc811573bc33169903 SHA-1: edbd7c83f2f1bbb3452771ca06fb76edef9d1e91 SHA-256: bc92fb3f27b34b09223304b6423bdb9fdb3e3578b3df70e8738eb056b00138d0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://kuzutuzo.ru/123?utm_term=aarya+2+audio+naa+songs PDF link annotation
    • https://cdn.sqhk.co/wepiwojeta/iyhcvie/7306788955.pdfIn PDF document text
    • https://cdn.sqhk.co/divoxisig/giiSFhf/flight_sim_2018_download.pdfIn PDF document text
    • https://lutatodu.weebly.com/uploads/1/3/4/6/134697406/db1828d2b176df.pdfIn PDF document text
    • https://cdn.sqhk.co/guzoladip/gDZp2AS/santa_vs_zombies_2_walkthrough.pdfIn PDF document text
    • http://wupulij.22web.org/sidawuxegutigupavotola.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/hhbgeOH/atmega328_datasheet_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/varugefezum/vNKjahf/barneys_farm_acapulco_gold_smoke_report.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuzajomugi/rijjg65/raluzofagasidirimojoka.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/iae9Pjg/85317063364.pdfIn PDF document text
    • https://cdn.sqhk.co/wazofovam/1FfC7hc/63815536405.pdfIn PDF document text
    • https://mijevofere.weebly.com/uploads/1/3/1/6/131606011/dipuwebolijojow-gupawoxumiluz.pdfIn PDF document text
    • https://wilitixovin.weebly.com/uploads/1/3/4/3/134351513/41bcfe5ac4.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/cjdLgct/10743375677.pdfIn PDF document text
    • https://cdn.sqhk.co/saseponirifa/TVBJ7Mv/cvt_transmission_repair_fluid.pdfIn PDF document text
    • https://cdn.sqhk.co/nuduniguwufo/xhii1tE/evolution_of_species_2_game.pdfIn PDF document text
    • https://kowedeta.weebly.com/uploads/1/3/0/7/130775164/021f4d8b3a82.pdfIn PDF document text
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/legogunatapemavitob.pdfIn PDF document text
    • https://cdn.sqhk.co/mutavewituro/jgdCeij/nilevokutuvowewuti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lakiver.epizy.com/boerewors_roll_business_plan.pdfIn PDF document text
    • http://gigezevozaf.epizy.com/91071550703.pdfIn PDF document text
    • https://e4cb95aa-ee47-4bec-abab-95a5b702e025.filesusr.com/ugd/4c76bf_5bad441cbf2345269ab2d866b6d5bfb3.pdf?index=trueIn PDF document text
    • http://rukotig.rf.gd/dufupi.pdfIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_bf16038683ee4e6593a8cc69ec15f16c.pdf?index=trueIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_ba0acd3fa80d4bfd86b9c413142dc6aa.pdf?index=trueIn PDF document text
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_a2b4f7b35ac843428d7f27caa792882d.pdf?index=trueIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_378ad000fd1940c381ff5a28ddb40f92.pdf?index=trueIn 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_off0000d449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD449 5184 bytes
SHA-256: 38282eb504e55fa43b7cf550312749fdc09c95832ece0cc6c2dbae2553e76cb8
font_01_sfnt_off0000e604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE604 10736 bytes
SHA-256: 28edc0b53e7b86bb56d4ee73c6eca66dc17f07e6fcf54b717c45c00b2286479f