Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d32442b219aa99…

MALICIOUS

PDF

83.4 KB Created: 2021-03-20 11:22:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bc6cb698b0e8b4ce6cc352cd6367ced0 SHA-1: 9f523b5a178a4c857538dc13c47d05992ae43916 SHA-256: d2d32442b219aa99c8ffe795f08455668c637952cd13c4db8e12779db0fae613
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 0.9994

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://dafemum.ru/123?utm_term=login+form+design+html+template PDF link annotation
    • http://rosutob.getenjoyment.net/poxagoto.pdfIn PDF document text
    • http://fitness-ital.fun/292627504520njnx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449419/normal_605158d85fda7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494891/normal_601719945901b.pdfIn PDF document text
    • http://panuxidoku.22web.org/what_does_a_regulatory_compliance_specialist_do.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/properties_of_austenite_ferrite_pearlite_martensite.pdfIn PDF document text
    • http://domavera.ru/evenflo_chase_lx_reviewsfflj6.pdfIn PDF document text
    • http://dabukim.mygamesonline.org/aircraft_maintenance_engineering_salary_per_month_in_india.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/mitejajizide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387814/normal_60306eea96f28.pdfIn PDF document text
    • http://kositexujir.sportsontheweb.net/53569141362.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_a969c0284a194228959dc0182bb3a48a.pdf?index=trueIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_25b611f6bfca4c509927d8fb4931d968.pdf?index=trueIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_0c254254bf574bb6bb68435ba9b20c72.pdf?index=trueIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_55e3a0bd125348ef95134c550a6fcb16.pdf?index=trueIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_c43d08aa074f4028ba1ba6812d04b081.pdf?index=trueIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_d671f6f71f1541e6b929386b01f17bb8.pdf?index=trueIn PDF document text
    • http://buvumurasamaku.rf.gd/brother_xr-65t_price.pdfIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_b54f403c43c742e58a579b5ac0663113.pdf?index=trueIn PDF document text
    • http://junopufobapepax.rf.gd/nowopip.pdfIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_535e5c44c0774267ab80fd9dc1014c84.pdf?index=trueIn PDF document text
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_9cc74b332155439fba830b9175aa1d2a.pdf?index=trueIn PDF document text
    • https://945c5b1a-9feb-4a08-b72d-c905ca1b1520.filesusr.com/ugd/27135d_07e2ceb6ee7e4417ad27151a860a9f69.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_off0001080b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080B 5396 bytes
SHA-256: 02a38574e7b85cf35606cd5cbd31ffc581c85394e1833e7edc5e1874d1f56b9c
font_01_sfnt_off00011a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A43 11132 bytes
SHA-256: fddf81f4f8dca221415184104374a82abff38fd0ffa53ab33b121432c941ab82