Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb21022d77ee027…

MALICIOUS

PDF

77.1 KB Created: 2021-03-18 07:14:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 78a408068d1e783689e9f000b9abb17f SHA-1: 683838dd9a93d6354185473fc6854bde21d40819 SHA-256: adb21022d77ee027b884516a3dc97b73e687d35db108df62cb314482e05c26a0
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The document body, though partially corrupted, suggests a lure related to 'worksheet answers', which is a common tactic for phishing or malware distribution.

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://jacksth.ru/wix?keyword=daffynition+decoder+worksheet+answers+page+121 PDF link annotation
    • http://francobusiness.com/bubble_gum_simulator_codes_wikik8swn.pdfIn PDF document text
    • http://onlinesos.tech/51042890162yudmk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477167/normal_600e4c60d06a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369324/normal_5fe3ed3f79aca.pdfIn PDF document text
    • http://kataeta.club/energy_worksheet_answersoauoy.pdfIn PDF document text
    • https://cdn.sqhk.co/zisuzunon/gchhgfQ/lagu_the_beatles_cover.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447884/normal_5fd391196899e.pdfIn PDF document text
    • http://bbflowers.net/allen_bradley_powerflex_40ptzaqd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454163/normal_5fd72d7dd0311.pdfIn PDF document text
    • http://ita-yog.space/58393237472vw0ci.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491414/normal_603b0724e7c34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481673/normal_602e5bf062040.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461211/normal_5fd7ce0443cd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387931/normal_603a06ff2369b.pdfIn PDF document text
    • https://cdn.sqhk.co/vuveleni/6NvgjK1/ziwufexibemora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384632/normal_600fb01286706.pdfIn PDF document text
    • https://cdn.sqhk.co/tazurusubiz/SsjbggN/5363456159.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490934/normal_5ff902afe7979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468296/normal_603dcacc3bc3f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 5828 bytes
SHA-256: 538ef0b984a1b5113c6edff9cf8cd30ef39c0e65d51ed39b0bdd3b4fed704be0
font_01_sfnt_off000103f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F0 10212 bytes
SHA-256: 033ea110405e428d9cf9f3a1c929e3dbb828bab43459b97d523614b3c459a207

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