Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b473e1ff9f6c00e…

MALICIOUS

PDF

76.3 KB Created: 2021-04-14 05:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e62b9152498f1f545d57931f214385e5 SHA-1: 2d914749649a46805465da00578eb0aeda0447fc SHA-256: 0b473e1ff9f6c00e8e435fb57eee0413065e017e30ffaa350249ef47fe0e0f91
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious content.

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://lozipotod.ru/strik?utm_term=cathy+caruth+trauma PDF link annotation
    • https://bexajaburise.weebly.com/uploads/1/3/5/3/135345802/fawikixetipotidu.pdfIn PDF document text
    • https://buwuwewofopalun.weebly.com/uploads/1/3/4/0/134097592/6298020.pdfIn PDF document text
    • https://tiwedipetubed.weebly.com/uploads/1/3/2/8/132816066/1b8b23.pdfIn PDF document text
    • http://ig-support-service.com/online_application_spanish_to_english_translationiyeej.pdfIn PDF document text
    • http://logmeinnow.xyz/607471873735r06y.pdfIn PDF document text
    • http://grafoanaliz.ru/douglas_adams_hitchhikers_guide_to_the_galaxy_audiobook89vi2.pdfIn PDF document text
    • http://revukajazoweku.22web.org/scotland_the_brave_piano_sheet_music.pdfIn PDF document text
    • http://like-store.site/bootstrapping_in_compiler_designi1whk.pdfIn PDF document text
    • http://topmassage.net/calisthenics_movement_workoutqslv2.pdfIn PDF document text
    • https://lelopotive.weebly.com/uploads/1/3/0/7/130738546/wubab.pdfIn PDF document text
    • https://merasata.weebly.com/uploads/1/3/1/3/131378960/6487288.pdfIn PDF document text
    • http://fasad-dom.site/putodufidugkz35.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_560093b649974be5aba7fba8cf7f94e0.pdf?index=trueIn PDF document text
    • http://padizidegenul.rf.gd/characteristics_of_culture_sociology.pdfIn PDF document text
    • http://zewupubo.rf.gd/73129824191.pdfIn PDF document text
    • https://2ce49c0c-752a-49d0-a831-a69229ee2afe.filesusr.com/ugd/6e9521_00fdde7f29244200952309011dcbf82f.pdf?index=trueIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_12ee252a96044a999b55323172030c86.pdf?index=trueIn PDF document text
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_5a488a0061064348a71c571f45f4798f.pdf?index=trueIn PDF document text
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_947faad5470045869fd4fecec4c9cf91.pdf?index=trueIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_f92e6213ffb94afab63e4012f7d60e9b.pdf?index=trueIn PDF document text
    • http://kagusamijutobal.rf.gd/64760392468.pdfIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_8714e9fcc18445ce8f0277b11b133ad0.pdf?index=trueIn PDF document text
    • http://vivimaga.epizy.com/bifikuliketenizovamuvulim.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_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 4836 bytes
SHA-256: 867ecdf6f97e319238a923564ebb96a13804569e3229a3b754a03b0906d94031
font_01_sfnt_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 10408 bytes
SHA-256: 3cddfc9f3c002bd2693b4ba17209d9bd06a21b8552a366794a7eafce20f221bc