Malicious PDF — malware analysis report

Static analysis result for SHA-256 9538db15a0ee6882…

MALICIOUS

PDF

82.8 KB Created: 2021-05-26 20:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f42d98b2bf6ac74ac36c036793e8d4ba SHA-1: 73ff1f18ad6b466401122f63bf3058766fbca1a3 SHA-256: 9538db15a0ee6882c1dde792206c2179d688cb1d43f6d1a7a76137b39cd92857
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URL and the PDF link farm heuristic point to a strategy of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/strik?utm_term=what+do+the+symbols+on+sirius+black%2527s+wand+mean PDF link annotation
    • https://felipivi.weebly.com/uploads/1/3/1/8/131856333/0ad9a58e.pdfIn PDF document text
    • https://lijupumo.weebly.com/uploads/1/3/4/4/134496400/9074251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484807/normal_6062f6590c0ff.pdfIn PDF document text
    • https://xidatajabo.weebly.com/uploads/1/3/4/3/134375349/sisisir-fododumegug.pdfIn PDF document text
    • https://mumizovis.weebly.com/uploads/1/3/4/3/134350635/pokefubunifo_puneb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370097/normal_603973be508bb.pdfIn PDF document text
    • https://tonezesonor.weebly.com/uploads/1/3/2/6/132681734/b3867da8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491439/normal_60532d269cb44.pdfIn PDF document text
    • https://babewepuk.weebly.com/uploads/1/3/4/3/134311046/fivavub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393898/normal_601e17371b08b.pdfIn PDF document text
    • https://lotutomoze.weebly.com/uploads/1/3/4/3/134309944/bakuk_ninizi_ludowakiravuwu.pdfIn PDF document text
    • https://vatanivirasuta.weebly.com/uploads/1/3/5/3/135387760/9940891.pdfIn PDF document text
    • https://paxutujuwibe.weebly.com/uploads/1/3/4/9/134904532/cd65278.pdfIn PDF document text
    • https://pozufijuxib.weebly.com/uploads/1/3/0/7/130775557/21196438916b4.pdfIn PDF document text
    • https://girusidopot.weebly.com/uploads/1/3/0/7/130738876/sufutodut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384644/normal_5fccec1de6c38.pdfIn PDF document text
    • https://vutofuwejazow.weebly.com/uploads/1/3/4/3/134321520/teminuv-wuniker-wegip-pepejoritisamos.pdfIn PDF document text
    • https://teditiwos.weebly.com/uploads/1/3/2/6/132681477/moluxo.pdfIn PDF document text
    • https://tusubolamofe.weebly.com/uploads/1/3/5/3/135322079/4171615.pdfIn PDF document text
    • https://paniwotipetusu.weebly.com/uploads/1/3/4/6/134614288/07b31b759880c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2fc8e124-5348-4e8f-9d93-3e4a83a62a5e/jojiluzana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40cce395-4c3f-4a79-9ca8-ea1ed4dd1d3e/alpine_ktp-445a_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d32e6fe-1f30-42e6-bce8-bbceb0b9518a/kupebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6044b4c1-e699-4694-b8af-9e959e958b3b/kijifupideli.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF716 5508 bytes
SHA-256: 4ba40098192de4463bc52925aa1cdcdb087defeaf1ad2a01d70f6c4b8fb722e1
font_01_sfnt_off000109c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C6 10888 bytes
SHA-256: 68ec9122271095fc58f9b55151f76e20ca860d5131ab2a500f4d8a3aaae83c73
font_02_sfnt_off00012eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEA 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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