Malicious PDF — malware analysis report

Static analysis result for SHA-256 10202b8e58093fdf…

MALICIOUS

PDF

78.7 KB Created: 2021-04-09 01:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3f7d3bf4f001b333a4fad1b14845046e SHA-1: 5e4e6edb2fae2c4fe5a5fcef5142fe1fbb3cd633 SHA-256: 10202b8e58093fdfcf20ee19ecd89515a6afbd64d4d950a4f58836bd1a9ccb12
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 0.9961

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://mezovuduw.ru/strik?utm_term=what+is+veil+of+ignorance+essay PDF link annotation
    • http://world-wildshop.com/672039528022hkx.pdfIn PDF document text
    • http://leopards.space/77195606969ww27n.pdfIn PDF document text
    • http://sis-paypal.com/sillimanite_schist_formation8gwdf.pdfIn PDF document text
    • http://istlan.space/ripenuzefa1a874.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404738/normal_6068c48cae3c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426945/normal_6064a902d40e7.pdfIn PDF document text
    • http://superheatbelt.xyz/kali_linux_hacking_commands_in_hindio3zqk.pdfIn PDF document text
    • http://momentshop.website/xbox_series_s_amazon_prime_day18i6o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448551/normal_5ff78d9203647.pdfIn PDF document text
    • http://sunshop.pro/how_to_write_a_curriculum_map80jsa.pdfIn PDF document text
    • http://digitaloffice24.ru/3901801264895y7n.pdfIn PDF document text
    • https://sigoberedida.weebly.com/uploads/1/3/4/5/134594083/2581583.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410002/normal_600e498150b7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484126/normal_6050fd404041b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376379/normal_6013ef5a54531.pdfIn PDF document text
    • http://inmyshtangen.xyz/gipojibodipiredowurejig34jj3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474445/normal_5fda8f0678d16.pdfIn PDF document text
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/9acb4.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/groups_of_the_periodic_table_worksheet_answersdqbqi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393035/normal_5feb2f1c4b8bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500447/normal_600a575f16409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380674/normal_60207abd373c0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/65762b2d-1150-418b-aa04-80db9a6b1437/12972380693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3af3e3d3-3040-4f0a-a981-0fdcbb5073d3/cooperative_federalism_simple_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2a451db-eec1-4131-b98b-cc838c06d13f/best_auto_repair_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/758ee625-0c0f-4716-a550-cdc77b4d2997/coleman_rv_air_conditioner_customer_service.pdfIn 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_off0000f759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF759 5320 bytes
SHA-256: b387d0fe15fa854beb431142e1cf07c1a0957fba6505ad4f32a13128b7b16cc3
font_01_sfnt_off00010985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10985 10384 bytes
SHA-256: 77484eca3e94fb40a59a5057d03fefa083e19e3b3eb2547c3dd98094cd7d6412