Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c94cb716e6caf6…

MALICIOUS

PDF

73.5 KB Created: 2021-03-15 11:37:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 867b9357a563f29baee298f42bc97efb SHA-1: 4cac303ceef8d1043d17002b273ca6e4b4448452 SHA-256: 84c94cb716e6caf607fb4be7a09bb2c25f6737667d0a05fc9a99d2e46e09358c
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to a 'manual' which is likely a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=richmond+essential+tankless+water+heater+manual In PDF document text
    • http://sipamuxagiporen.iblogger.org/solitaire_cube_for_android.pdfIn PDF document text
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/nodaxod.pdfIn PDF document text
    • https://detitominaxa.weebly.com/uploads/1/3/5/3/135304018/nanunijej.pdfIn PDF document text
    • http://lasozenixirek.iblogger.org/6488046025.pdfIn PDF document text
    • https://cdn.sqhk.co/fomeluxilim/HJhdbjd/kigoxenenosas.pdfIn PDF document text
    • https://cdn.sqhk.co/xivijela/njjgghi/bitobuwobopikufe.pdfIn PDF document text
    • https://cdn.sqhk.co/gavezexu/jicjehi/download_army_clash_mod_apk_for_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuzudaru.epizy.com/zaxadavuruku.pdfIn PDF document text
    • http://jeromixowo.epizy.com/topokexokekumekifakezukat.pdfIn PDF document text
    • http://tajadisiri.rf.gd/anticonvulsivantes_veterinaria.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/situleji.pdfIn PDF document text
    • http://sagisat.rf.gd/50447331159.pdfIn PDF document text
    • http://xepadegi.epizy.com/zufidodedelepokenapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dbc43cd-44b8-4afd-9f30-ecd1ce63a038/buralej.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/daxizewoxiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b767bfe5-729b-43bb-a78f-e0c0503b0085/pedobanewadavositiguni.pdfIn PDF document text
    • http://pivasif.rf.gd/90440310212.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/vegudemeroz.pdfIn PDF document text
    • http://zideniniwos.epizy.com/86105668574.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_off0000e0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D7 5344 bytes
SHA-256: 7135da8186aa90494126b8d07e9e3c15eec3c801653156cf8b9984db418245b2
font_01_sfnt_off0000f2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E4 10920 bytes
SHA-256: 610e8b28f78fe365c3b6ef6338ee43e75ac1418b7578311ddae321e69ee44d5b

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