Malicious PDF — malware analysis report

Static analysis result for SHA-256 41bbec16fcfe1518…

MALICIOUS

PDF

80.3 KB Created: 2021-03-16 03:18:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7ae17409bfa34c79e25a821ddbc67e86 SHA-1: da6831ec9c6dcaa13a2059d794ffbc0a5b93fc3b SHA-256: 41bbec16fcfe15184675c1f7c0fd77f2aa972563f2ca96327bcc45d62cca8f60
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting or are part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure strongly suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://xajibur.ru/award?keyword=shake+hands+with+the+devil+pdf+book PDF link annotation
    • https://zutomivopisi.weebly.com/uploads/1/3/6/0/136051870/ludetisupo-navifebotodel-winobin.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/Z1GkBuB/telepsychiatry_services_in_nc.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/GibXji6/bisodeligerivideme.pdfIn PDF document text
    • http://wufujapebapu.22web.org/wulurumirupixabixidiwa.pdfIn PDF document text
    • https://kisobodowawon.weebly.com/uploads/1/3/1/3/131384145/e4c28bed8e599.pdfIn PDF document text
    • https://fekubikutoji.weebly.com/uploads/1/3/4/1/134108901/feduvamosopuvu.pdfIn PDF document text
    • http://wifefavowe.iblogger.org/wedding_invitation_psd_template_full.pdfIn PDF document text
    • https://cdn.sqhk.co/delotijuw/aFdghCc/92230154552.pdfIn PDF document text
    • https://cdn.sqhk.co/kopenanum/Ibqhfjb/doramokupakogujilizeser.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459028/normal_6001535798a1d.pdfIn PDF document text
    • https://telisawe.weebly.com/uploads/1/3/4/4/134466193/tigid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416504/normal_5ff64b061a534.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rexerikilo.epizy.com/film_alucard_vs_lancelot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f212e7b9-4587-425a-bdce-c38202274e7d/pativiturake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dbde045-3b6b-43d6-8ec0-f6b28ce52457/harbrace_college_handbook_wikipedia.pdfIn PDF document text
    • http://mudotepejix.epizy.com/kamivukijewivumafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6b77e98-ec2c-49d0-811b-12cd3a8fd161/45909064455.pdfIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_c5b931b6d1fb42c3ac2a250bfeb6f707.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f77fc48-1c5b-41fc-93a0-3a19d4b1e0aa/relion_blood_pressure_monitor_hem-741crel_4g.pdfIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_b11e6f7f59b34a67b97d28d5d1805f48.pdf?index=trueIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_97f4f38da9ae4b2bb3afe9982f0004f5.pdf?index=trueIn PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_bc5bb15bfebe4b66a6c88725087bfd89.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f410b2f2-b976-4732-8e87-f4a705c846b5/temudabad.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_off0000fc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC91 5492 bytes
SHA-256: 0f8a0423c4064bb018f404befd905d2e96737527ffa31e4650188900bfdc3172
font_01_sfnt_off00010f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F51 10656 bytes
SHA-256: 8c1b1d0d3341d2a9260b37193a8fa70a9989e811337999506d0cc753b87f2e0b