Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8bf08ff91472a8…

MALICIOUS

PDF

79.3 KB Created: 2021-03-25 04:21:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 56b92f46b9903eae6a2325d454102aec SHA-1: 85137442b647a8064fcc0a1c0e2d084be94aa5aa SHA-256: 3d8bf08ff91472a80ce497a385bfe211579366fa137f1d67559aa49712cd8870
186 Risk Score

Malware Insights

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

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 0.9998

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://xajibur.ru/strik?utm_term=skyworth+50+4k+smart+tv+reviews PDF link annotation
    • https://reropazorulofo.weebly.com/uploads/1/3/4/4/134437501/fuwatiberotumiv.pdfIn PDF document text
    • https://damobupakul.weebly.com/uploads/1/3/1/4/131453350/02c29537af2fba5.pdfIn PDF document text
    • https://fisadurubimu.weebly.com/uploads/1/3/1/4/131409264/798642.pdfIn PDF document text
    • https://kerimoseb.weebly.com/uploads/1/3/5/2/135299904/xubusakawet.pdfIn PDF document text
    • http://astrohelp.space/angry_crab_shack_surprise_az_menuqi4wh.pdfIn PDF document text
    • http://begemotiks.space/vonutojajbiyy.pdfIn PDF document text
    • http://ufenmac.com/62045381894lwdem.pdfIn PDF document text
    • https://lepekogiba.weebly.com/uploads/1/3/1/6/131637498/lawimad.pdfIn PDF document text
    • https://nugilura.weebly.com/uploads/1/3/5/3/135317706/2783385.pdfIn PDF document text
    • https://gewasulupav.weebly.com/uploads/1/3/0/7/130740056/rimotefinum.pdfIn PDF document text
    • http://znohist.site/how_to_sing_eminem_rap_godkpm1y.pdfIn PDF document text
    • http://nijuwebil.iblogger.org/82204556629.pdfIn PDF document text
    • https://xatoxelal.weebly.com/uploads/1/3/1/4/131482937/tuzota_pulepobofolinob.pdfIn PDF document text
    • http://tk-time.site/gopro_hero_5_black_quick_guideucuhg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tukekutiwele.rf.gd/bowokadarerinojaleditilur.pdfIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_5b70a6995b5a4a7d8792b9bd6930b29d.pdf?index=trueIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_95628fcf04e848c4b2f49776466fc908.pdf?index=trueIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_12f992d6f2f04f1fbeb4edf140f1b437.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_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 5668 bytes
SHA-256: 26aeae45ddfcc7ad547feaaf7bfcef06d8ebbcad4d35186a7dd8751bad88856d
font_01_sfnt_off00010be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE0 10536 bytes
SHA-256: 98620654363465312635ef83448640e0f6022e9cb9a50763121750da4dc031cd

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