Malicious PDF — malware analysis report

Static analysis result for SHA-256 b916b43859fee4eb…

MALICIOUS

PDF

83.9 KB Created: 2021-04-23 20:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e6cabdc97ca76187f22579ff107b5c47 SHA-1: e93ac1932c953de55ce3633881fa399bca08c05e SHA-256: b916b43859fee4eb84960488fb2efad46c565a06cc1776d27b78a232086b975f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting or redirectors, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gimoguvi.ru/strik?utm_term=webasto+marine+diesel+heater+troubleshooting PDF link annotation
    • http://winovigamaj.mygamesonline.org/4021233671.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/bugsy_malone_play_script.pdfIn PDF document text
    • http://jologedeb.getenjoyment.net/63461574885.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_11bd51d38b25474ca0a7f2de9a9a6872.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvarelo/fnaf_world_character_unlock_guide.pdfIn PDF document text
    • http://bixozebaxikapos.atwebpages.com/how_to_use_xr2_remote.pdfIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_47ea523c2af047149eadefa350c44c56.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lumixi/what_is_wahls_protocol.pdfIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/34229422704.pdfIn PDF document text
    • https://bbf05351-1c49-455c-8ea8-df349977a4d5.filesusr.com/ugd/15c6d6_1f850d76382640a2b3d3a67effb39977.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_0131b7f9e876443f84e564c0cc84de70.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/pimixirosesopif.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/venupoki.pdfIn PDF document text
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_113a3d81c9e540c09d5231d340087764.pdf?index=trueIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_50f4c9c25d7f4bcfb7c51242cf67556b.pdf?index=trueIn PDF document text
    • http://kexomun.myartsonline.com/emotions_definition.pdfIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_f3e8c6ba7598413896fd11bd7db91a06.pdf?index=trueIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_b0248653d79a4e54950a6ce78a95a391.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/the_return_of_the_king_extended_edition_runtime.pdfIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_dde80eb471ef401391669d2eddd02fb3.pdf?index=trueIn PDF document text
    • http://gixarewujedel.atwebpages.com/46055368526.pdfIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_1cc4ce0c68b049d599540f79d92f892e.pdf?index=trueIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/layers_of_atmosphere_in_order.pdfIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_dcad8ea5a18f42bb8f5eaff11e86d196.pdf?index=trueIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_a7b4f0775ee8482d9218f4406efafe8b.pdf?index=trueIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_7e07ed9754894ee48193289ced1c18d4.pdf?index=trueIn 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_off000109a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A9 5392 bytes
SHA-256: 2f40983469b760a47a5eda69fb49bdf8e3003f251c9f73bf1532a13d6ae825cb
font_01_sfnt_off00011bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD8 11064 bytes
SHA-256: 00822593c57a9a60c58d9371e137b111467f5911830933258d313affd1c4f3b6

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