Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e20cec55885be7…

MALICIOUS

PDF

72.3 KB Created: 2021-03-09 20:21:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 285ab1c7a173370bdf283d9125820b92 SHA-1: 4d56e9340c4bd9209bfc998dff921c132053e858 SHA-256: 59e20cec55885be70aeff5d39a2ea452b7a07f833cc9ffb09f05722df5c548f8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves directing users to external resources via a link farm, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/award?keyword=primeiras+aulas+de+ingles+pdf PDF link annotation
    • https://cdn.sqhk.co/parikozug/1ijKggm/investor_s_business_daily_trading_summit_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/fosasukenum/JIicC4i/werepobilin.pdfIn PDF document text
    • https://cdn.sqhk.co/zeterabaxax/aghhgcs/12707922308.pdfIn PDF document text
    • http://it50off.pro/56848831058a4tnj.pdfIn PDF document text
    • https://cdn.sqhk.co/miseseren/ejbnohd/kijerebazel.pdfIn PDF document text
    • http://bluhgang.best/49358459871vhf4t.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/how_to_use_new_microsoft_office_access_2007_database.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/ificVjf/metal_radio_online_streaming.pdfIn PDF document text
    • http://dazolovegom.mygamesonline.org/gurps_lite_combat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_5baf7dd92f954e6993b19205b98f37ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/fozokori.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/fadipaladamizufuvi.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/medical_certificate_form_42.pdfIn PDF document text
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_9905bef4c1644d85b192ad320c7521cc.pdf?index=trueIn PDF document text
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_3e692dba25f14534833c4540c572ff98.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/alex_rider_stormbreaker_book.pdfIn PDF document text
    • http://polilofu.onlinewebshop.net/star_wars_thrawn_ascendancy_book_1_chaos_rising.pdfIn PDF document text
    • https://0115c081-d8bc-4983-a705-81db93bf1442.filesusr.com/ugd/990402_2fe0856927d94b6fa4112db9b4edda42.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/arlington_county_va_police_report_online.pdfIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_b670de56e28641c6a75b6bc8ad38e55d.pdf?index=trueIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_4d931134759c4845b07dcedccceceda0.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_off0000dcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB8 5360 bytes
SHA-256: d124615088a344663b22dc2aa0a1208dbe3b623f1736457556e4a0f5c443d16c
font_01_sfnt_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 12076 bytes
SHA-256: 94807fd98952da2df4318fbd7e881b76b0ca912fa00375ec1d9cac184afcafbe