Malicious PDF — malware analysis report

Static analysis result for SHA-256 41aa45ea4749df6d…

MALICIOUS

PDF

73.0 KB Created: 2021-02-18 16:42:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 37b57524c8790209bb4d08ad0ad2f3bb SHA-1: 2d4ca0e7c700f3235afb33025cd093c793c27b7c SHA-256: 41aa45ea4749df6dd61f048d70c8e4b06c60b2705c197ce5557fad68c34d88dc
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=how+to+factory+reset+samsung+tab+a+10.1+without+password PDF link annotation
    • http://g2am2e.xyz/28233840826swd1g.pdfIn PDF document text
    • http://naturmilans.fun/mejopusifebef7m5y1.pdfIn PDF document text
    • http://kosolibanun.iblogger.org/apa_manual_citation.pdfIn PDF document text
    • http://natiral.space/price_of_pomeranianxrdha.pdfIn PDF document text
    • http://amin-ukraine.net/51758976366gt030.pdfIn PDF document text
    • https://kiziwovoxapi.weebly.com/uploads/1/3/4/6/134617524/9185215.pdfIn PDF document text
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/maliwepibuxenip.pdfIn PDF document text
    • https://dukiferuxol.weebly.com/uploads/1/3/0/8/130873869/bf10a22.pdfIn PDF document text
    • https://mogobuzuxoxede.weebly.com/uploads/1/3/0/7/130740257/sexozogek.pdfIn PDF document text
    • https://kuwodugedo.weebly.com/uploads/1/3/0/7/130739904/gawul_duxovur.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/remuv/torifidofilosekamuronawuk.pdfIn PDF document text
    • http://gegawuwiru.epizy.com/assamese_sad_love_poem.pdfIn PDF document text
    • http://lutatiduz.epizy.com/eternal_atake_leak_zip.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_off0000decd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECD 6060 bytes
SHA-256: fd9c163095b41a2ec7102509de42819b1c5e7ec43523c458d7668c5c6cd04760
font_01_sfnt_off0000f362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 10420 bytes
SHA-256: 3eaeb251a59c4a021dd8d78833baeb23ffe3cef317ad5bf1b1cc1822c06c7d2c