Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b794e1b5a8707c…

MALICIOUS

PDF

79.0 KB Created: 2021-04-26 23:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67b5fd09ed9d2e644b087d3b265927c7 SHA-1: 36894ddf12cae2724b8fa2b70f531b6aa631d6df SHA-256: d2b794e1b5a8707ca2e01a0ab06498adc83dec864b1e117e29cc4abfbba76030
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'atoms and molecules worksheet grade 7' and 'wkhtmltopdf', indicating a lure to disguise the malicious nature of the document.

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://druttle.ru/strik?utm_term=atoms+and+molecules+worksheet+grade+7
    • https://cdn.sqhk.co/midipumep/EmzijsO/online_compiler_editor_with_stdin_api.pdf
    • https://cdn.sqhk.co/gizukakom/mujdib1/58922872723.pdf
    • https://zixavuxo.weebly.com/uploads/1/3/1/3/131398386/9675418.pdf
    • http://drive4mclaneeffingham.com/fast_racing_neo_romiudsi.pdf
    • http://diporesorojina.scienceontheweb.net/kejukikufudebapijov.pdf
    • http://serviceforyou.site/nurumavelufuridlnw9q.pdf
    • https://ziliseze.weebly.com/uploads/1/3/4/8/134855349/1180180.pdf
    • http://shtangennstutkupitseychas.xyz/93733659100kucq1.pdf
    • http://importants.space/7972323738jp6rr.pdf
    • https://cdn.sqhk.co/tubafejog/aRMichb/mega_anime_avatar_creator_unblocked.pdf
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/326482.pdf
    • https://cdn.sqhk.co/jutigurotow/ifjNJhe/86021219443.pdf
    • http://gutprod.xyz/12281552262el6ax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://magegefopo.atwebpages.com/28476982350.pdf
    • http://kivozusemu.atwebpages.com/wafunojakuw.pdf
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_1a858c5ceb6d403b85d2f562ff2edfda.pdf?index=true
    • http://vexabimumemig.atwebpages.com/jatajanijusarolexaw.pdf
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_d7dc2ed0f90447b798c40f876820e5a5.pdf?index=true
    • http://vamavaremimot.atwebpages.com/73493745251.pdf
    • http://naxepedawizozet.onlinewebshop.net/lepuw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e6.bin
2cddd1719212cf2c79599d202bdb72b4fd1b733e8e91b06ca4f05cdcd2eedf35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 5580 bytes
font_01_sfnt_off000108c9.bin
9f6902a8f977de23fd67c0da8b4efac5e0b20faede1fef623ee8431a086836aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108C9 10976 bytes

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