Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b64cca0895ef85…

MALICIOUS

PDF

68.3 KB Created: 2021-03-06 07:24:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 62a6400ad12c6e1a85f5ff723049a4bd SHA-1: a637e4c4f4766eb8dc972eb188c932670d6910c1 SHA-256: 93b64cca0895ef85da360fa59a04ba856ae8e2d332893d760aa10d72063753af
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded URLs point to various domains, some of which are hosted on disposable services, further supporting the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/wb?keyword=bowflex%20xtreme%202%20se%20owners%20manual PDF link annotation
    • https://mibofadap.weebly.com/uploads/1/3/1/6/131637701/9634098.pdfIn PDF document text
    • http://classicalnaturally.com/98148969872b9dyi.pdfIn PDF document text
    • https://vomuxetajamusu.weebly.com/uploads/1/3/1/8/131857717/6416206.pdfIn PDF document text
    • http://lnstagramservicecopyrights.com/takudilexisomimemorupukis5g1.pdfIn PDF document text
    • http://xviiivbgz.com/varutotujuwuworujufomimol7zufg.pdfIn PDF document text
    • https://vulewerogoxo.weebly.com/uploads/1/3/4/5/134507491/420558.pdfIn PDF document text
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/fevuz.pdfIn PDF document text
    • http://lavka-karamel.ru/tuxoxokibumatupodefugapexxjvrb.pdfIn PDF document text
    • https://lilonukile.weebly.com/uploads/1/3/4/7/134767916/butozumozako_kuxudapemavuvu_gigapedizobe_xagixepus.pdfIn PDF document text
    • https://vidijizuv.weebly.com/uploads/1/3/0/7/130776341/714316.pdfIn PDF document text
    • https://kekisadubivef.weebly.com/uploads/1/3/3/9/133986731/b6296526a33d0.pdfIn PDF document text
    • https://rewumakabaw.weebly.com/uploads/1/3/4/8/134856880/5159593.pdfIn PDF document text
    • https://jufoximivovanad.weebly.com/uploads/1/3/4/0/134013024/2792929.pdfIn PDF document text
    • https://xatoxelal.weebly.com/uploads/1/3/1/4/131482937/dajuxosatozubit.pdfIn PDF document text
    • https://poxatekegevu.weebly.com/uploads/1/3/4/7/134753674/turamuritasijel.pdfIn PDF document text
    • https://gujuxufun.weebly.com/uploads/1/3/5/3/135398829/pikupumawipava.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/musoxifuvitalo/lavupowejideb.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/womemadiba.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/how_to_get_pet_safe_collar_off.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b3ffff7-6f28-4da9-9716-b07810950c4d/onan_4000_microlite_generator_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/denuxodenejafuwef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d8b840d-f404-4181-8b5a-4ad69096f0d4/stairway_to_heaven_korean_drama_episode_13.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2871ad0e-0a0a-488b-ad7f-f2c3710cbb9c/robemusobejulafuveraletez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5064cf8e-2785-4414-bdb7-3eaa8485bfd2/zifazimepuvapiwubegigolib.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_off0000d19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19D 5252 bytes
SHA-256: d423d96d76c7251869b625120e394f5241fb232a0035b7d341e656907a527057
font_01_sfnt_off0000e37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37C 9348 bytes
SHA-256: bbbfc359329fe3b1a61731ccf29f02278094bfc415eb6a1272c440b9a60a4ebb