Malicious PDF — malware analysis report

Static analysis result for SHA-256 949b61bc070b0204…

MALICIOUS

PDF

73.0 KB Created: 2021-04-07 07:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 27165edf2ee10e784e3fd729fbeb98ed SHA-1: 786a42c56fb0734498a45c7feae0e0b00294bcc8 SHA-256: 949b61bc070b0204c369a55897785544eabe1edd923e93d5c9fdd04b7a308be6
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains multiple external URIs, with one specifically pointing to a URL that appears to be a link farm designed to redirect users. The presence of numerous links on disposable hosting further supports a malicious intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/123?utm_term=free+2d+intro+templates+after+effects PDF link annotation
    • http://vashmaster.info/can_you_add_apps_to_echo_show_8290yq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489057/normal_600a3eb87a7d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423714/normal_60178b02d900f.pdfIn PDF document text
    • http://nejibaz.22web.org/daxapidulodomekivogupan.pdfIn PDF document text
    • http://podeves.xyz/75174947986bwyh3.pdfIn PDF document text
    • http://fevavoke.iblogger.org/common_core_standards_ela.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuropomap.epizy.com/endangered_species_free_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/atikmdag._sys_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/how_to_update_vizio_smart_tv_e40-c2.pdfIn PDF document text
    • http://zojabavikejowi.rf.gd/89793707693.pdfIn PDF document text
    • http://watenuzigoxabi.rf.gd/dasiboxigosow.pdfIn PDF document text
    • http://dodinakek.rf.gd/bidam.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/46265839050.pdfIn PDF document text
    • http://sufiwufefolama.rf.gd/8482538698.pdfIn PDF document text
    • http://zijiwaras.onlinewebshop.net/28058760876.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_off0000deba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBA 5388 bytes
SHA-256: ec972f1c3df410aa9a2748fde96b76d9ad53b605e9b86df6ffe8ae0614e782bc
font_01_sfnt_off0000f0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 10640 bytes
SHA-256: 99be7167c1a1a4832d9b8b23c6f4f434b1f68f720461967074e52b551c4257d5

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