Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29fff984d0e5bf9…

MALICIOUS

PDF

73.9 KB Created: 2021-03-21 09:16:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b456f890c202ebcfc0021334a30e22c8 SHA-1: 0fcc3fe83a77518105a9ad5ca4cd655f8cf127e4 SHA-256: a29fff984d0e5bf9cd35f0f1ac4d89b3e545dbae10381849765b6358896550ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9999

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://seumenha.ru/123?utm_term=smartsheet+help+line PDF link annotation
    • http://inter-kalinka.ru/casio_wk-1630_76-keygp8km.pdfIn PDF document text
    • http://fionainthefield.org/29936661293cycju.pdfIn PDF document text
    • https://vuvoxuwamulixa.weebly.com/uploads/1/3/0/7/130739220/9940f576c05bae.pdfIn PDF document text
    • http://usesucre.pro/677382174410xlts.pdfIn PDF document text
    • http://xozonline.ru/nike_air_force_ones_womens_high_topselwoo.pdfIn PDF document text
    • http://kuvezowepo.scienceontheweb.net/que_es_abandono_escolar.pdfIn PDF document text
    • http://nomudepalak.medianewsonline.com/12708754337.pdfIn PDF document text
    • http://amst-watch-v2.club/hero_xpulse_200_rate_in_nepal87q99.pdfIn PDF document text
    • http://idealica-tufficiale.website/anya_oxi_nudejbwg1.pdfIn PDF document text
    • http://fomilexavekol.22web.org/why_do_we_need_energy_in_our_daily_life.pdfIn PDF document text
    • https://zotorakiv.weebly.com/uploads/1/3/0/7/130739478/1346852.pdfIn PDF document text
    • http://cetop.xyz/top_general_merchandise_retailers220fd.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/tudawufed/jajetoxemudu.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/22559499709.pdfIn PDF document text
    • http://xepododulujex.epizy.com/39704923230.pdfIn PDF document text
    • http://kamabutexukawiv.rf.gd/22157807635.pdfIn PDF document text
    • http://gebibem.epizy.com/bofezuxo.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_off0000e3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D6 5160 bytes
SHA-256: a97ae77584d6efc61ae150661d378a281a2ba760eba614cde3e910007dbb88e5
font_01_sfnt_off0000f52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52E 10688 bytes
SHA-256: 5b439611454f2aab353affe9bce084ee096d5bc0c8a71973e3141281713ce13f

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