Malicious PDF — malware analysis report

Static analysis result for SHA-256 bee6055c00b518d6…

MALICIOUS

PDF

88.6 KB Created: 2021-03-28 22:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94f4aa74531d29445c0f6cc1b82b6202 SHA-1: 1642b1892dbf8575ce003a88bf98dbb43653a19a SHA-256: bee6055c00b518d660deb761e40a68f1e4c4eafd94593eb0fe5d5aa6e911a37d
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 hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and numerous external links point towards an attempt to exploit users by directing them to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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.
  • 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://jottigo.ru/strik?utm_term=the+crucible+act+1+study+guide+part+2
    • https://labaveboto.weebly.com/uploads/1/3/4/6/134611097/laname_mukabole_sedukoji.pdf
    • http://ladunosim.sportsontheweb.net/63107814057.pdf
    • https://cdn-cms.f-static.net/uploads/4464850/normal_603dcb8b9ccfb.pdf
    • https://gopaxabog.weebly.com/uploads/1/3/5/3/135309926/3203548.pdf
    • https://wufomuwu.weebly.com/uploads/1/3/0/9/130969972/kedaf-soruvokufiti-daboronunew-nituwopuxitol.pdf
    • https://cdn-cms.f-static.net/uploads/4420939/normal_603c38a0dbc52.pdf
    • https://static.s123-cdn-static.com/uploads/4489983/normal_5fe039f8aeb75.pdf
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/67902bd.pdf
    • http://xuzotudaraderuf.mypressonline.com/gawodonamuzemakidam.pdf
    • https://zirefugat.weebly.com/uploads/1/3/0/7/130740019/xubali_dalun_xapitetopek.pdf
    • https://static.s123-cdn-static.com/uploads/4445107/normal_5ff3f0d089c30.pdf
    • https://gasinokumujum.weebly.com/uploads/1/3/1/4/131437883/bezuvaw-bewubikafez-mifava-fazuz.pdf
    • https://cdn-cms.f-static.net/uploads/4382407/normal_60342f87b2cc6.pdf
    • https://sabiwivilo.weebly.com/uploads/1/3/4/3/134316676/39725c6487d2.pdf
    • http://zapixexarepol.medianewsonline.com/pdf_akuntansi_keuangan_menengah_1.pdf
    • http://mopexaxurip.getenjoyment.net/vehicle_check_sheet.pdf
    • https://vatawasuri.weebly.com/uploads/1/3/3/9/133997312/somitebokaboz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_a83d82cccef44d8e98cbbd0f6c3e9b2b.pdf?index=true
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_3febeb9348734596aece580995e355f4.pdf?index=true
    • https://4868a29a-6d77-448d-a9c5-bc5c6a1713c3.filesusr.com/ugd/060e50_22bc123359a64996a9c4eef4f48fe1a9.pdf?index=true
    • https://39c3e2ba-dcb8-4bc0-9ed7-0058f02c59d5.filesusr.com/ugd/fd4c29_5b508b86b913461a9fa9a5966b83727d.pdf?index=true
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_73306f601afc47b683e7218053d7f791.pdf?index=true
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_a6dc8cbbeb814cb6a73f332d5010a2d1.pdf?index=true
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_da8d2c2835a34856832f70a9ad3e39d3.pdf?index=true
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_67f601eace8d45cf8a3b3baedeed24d2.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f52c.bin
6d8dae51780f26dd2352ad684aa19be7be1af143e9e0243c94bdbbf36ea7eb6c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF52C 5376 bytes
font_01_sfnt_off00010792.bin
7a4b9f0fea1e3cd20b2a74da96caf17b08bdbb78e0c672ab1f97f85eb5288d58
pdf-font-stream PDF embedded font (sfnt) at offset 0x10792 12220 bytes
font_02_sfnt_off000130c0.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
pdf-font-stream PDF embedded font (sfnt) at offset 0x130C0 16204 bytes
font_03_sfnt_off000145ee.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x145EE 4324 bytes