Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8a03b2076d18e6…

MALICIOUS

PDF

82.1 KB Created: 2021-06-07 13:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1216231ea3d51ccba7d3a0841ac2dfea SHA-1: 9a77aa557af033e5d650e1c315382dbccc5ed6d7 SHA-256: ae8a03b2076d18e6cef2e366230ca505556862b2d2b670b47c0b583178af4145
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/pbw?utm_term=mvci+driver+for+toyota+64bit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451368/normal_6038194b876fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368266/normal_5fda6bbed7d52.pdfIn PDF document text
    • https://tifedagarowab.weebly.com/uploads/1/3/4/6/134641562/9389bafabbe.pdfIn PDF document text
    • https://tigasuzile.weebly.com/uploads/1/3/1/3/131379741/fajiraned_nazosi.pdfIn PDF document text
    • https://tabuxeniki.weebly.com/uploads/1/3/2/6/132682737/jexirojex-pibuvefefov-pirupedibo-mawutas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384318/normal_606e7b154e4d9.pdfIn PDF document text
    • https://jezemubo.weebly.com/uploads/1/3/6/0/136094449/14922583145c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/adf74c58-1189-4198-87c3-99633f3bfa1f/93081922243.pdfIn PDF document text
    • http://dujimowiwup.pbworks.com/w/file/fetch/144694437/fiminopopunag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff90e91c-0616-4a54-9d65-0b40e50ec49a/shadowrun_snes_stats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ae8f890-d1ff-40df-9185-45c4ef8ee66a/1295088640.pdfIn PDF document text
    • http://bokibagaror.pbworks.com/f/laxekeliwudodekikatolewuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfc1e6da-1cd2-446c-a50a-3ae2d90ca092/is_breville_good.pdfIn PDF document text
    • http://jivevisubido.pbworks.com/w/file/fetch/144600933/tabla_de_equivalencias_milimetros_pulgadas.pdfIn PDF document text
    • http://pajawazo.pbworks.com/w/file/fetch/144779778/gebadipamewubi.pdfIn PDF document text
    • http://pajajafilexe.pbworks.com/w/file/fetch/144720039/jolly_phonics_songs_letter_c.pdfIn PDF document text
    • http://gulisapil.pbworks.com/w/file/fetch/144779985/heart_failure_guidelines_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ab5e1bc-ad3b-4a0e-911c-d75745af88f1/28916126555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb7e8668-74bb-4437-b482-5587073d8944/fixejazebadiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c19b0b8-e86d-4b0a-9c33-26faeb70c380/91585052128.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/w/file/fetch/144621324/47781924021.pdfIn PDF document text
    • http://noxixap.pbworks.com/w/file/fetch/144426321/ruxujabudasupukedewiked.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_off000101ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 5356 bytes
SHA-256: 5c4937283dcf0d8539a7741ff9b1c309e6cd11e3e5c6696352881b29f0afdfb4
font_01_sfnt_off0001142d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142D 11412 bytes
SHA-256: 974f07457a191bef888db9903e690f7f2ed95f6e9fa700be258f54d53c6a7bf5