Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78f19670195eae9…

MALICIOUS

PDF

69.5 KB Created: 2021-01-19 17:05:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 424a293381e9fbb79736ace5ee195ded SHA-1: 2fc353cb27794694dcd12ef163516b3f4386791a SHA-256: c78f19670195eae970425fd5cd009b2b26ee570c9bcf4cf86de90ffb90f6969d
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, forming a link farm hosted on disposable domains, which is a common tactic for distributing phishing pages or second-stage malware. The embedded URLs suggest the primary goal is to redirect the user to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/aws?utm_term=recorder+music+sheet+easy PDF link annotation
    • https://fevixivosetakub.weebly.com/uploads/1/3/2/6/132681861/temiluf-renafelo.pdfIn PDF document text
    • https://saxepuxuk.weebly.com/uploads/1/3/4/4/134472003/8734fbe.pdfIn PDF document text
    • https://pazovazorukilaz.weebly.com/uploads/1/3/4/6/134673506/kogafekaxezobifu.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/0eb28f.pdfIn PDF document text
    • https://vifexaxelis.weebly.com/uploads/1/3/4/4/134482988/1099923.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386076/normal_5fa49fc958b7f.pdfIn PDF document text
    • https://kidivine.weebly.com/uploads/1/3/4/5/134576756/773e802d.pdfIn PDF document text
    • https://vozoduxi.weebly.com/uploads/1/3/2/8/132815828/mawadugu-sefarabogiv-sisipeligerasun.pdfIn PDF document text
    • https://teduminerat.weebly.com/uploads/1/3/4/6/134665194/zupotudepizo-zofolodubopa-sulojenubes-xizeximenenez.pdfIn PDF document text
    • https://nikuwexipamojag.weebly.com/uploads/1/3/0/8/130813731/1906324.pdfIn PDF document text
    • https://xixemoxutosiseg.weebly.com/uploads/1/3/4/4/134473276/67740f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zufejudo.epizy.com/aptoide_app_for_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/riveduvulogeligovumil.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/19316436105.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_off0000d4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AC 5256 bytes
SHA-256: b3c5fba2934a2df0b8189e32e91ff0ec5a0e76fd5f211bd432cbe7045cbdcf95
font_01_sfnt_off0000e66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66A 10244 bytes
SHA-256: 07dc6a81b8c5f5d7768cab9acdbbda35f22927b298f2fdc9b168384b39ebb2b3

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