Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d0e41def25c735…

MALICIOUS

PDF

71.7 KB Created: 2021-03-29 02:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 79f777984b2dc2817021041db2260937 SHA-1: b85210dad4729b7b59f537c1404f2d41679d2358 SHA-256: 66d0e41def25c7357f164c347dafcfd908fd25fab3654ba7c9d4ad755b8d24b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9990

Heuristics 5

  • 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://nipisod.ru/strik?utm_term=the+fall+film+streaming+ita PDF link annotation
    • https://bokosemebejira.weebly.com/uploads/1/3/0/8/130813317/ziriroboz_gedetaxagek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417648/normal_5ff24c7dcd951.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366048/normal_5fffd9b5aeeaf.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/Fpjbcox/1_pics_1_word_what_the_word_6.pdfIn PDF document text
    • https://tetemubegogik.weebly.com/uploads/1/3/4/4/134443084/vorem.pdfIn PDF document text
    • https://cdn.sqhk.co/ferobisuw/icJMq9O/coloring_cognitive_benefits.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413851/normal_601c016215cd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413456/normal_601421746264f.pdfIn PDF document text
    • https://zuwejuropuri.weebly.com/uploads/1/3/1/6/131606208/cf5e5272cdb86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480382/normal_6033d66c12e58.pdfIn PDF document text
    • https://cdn.sqhk.co/wusuzevomo/khRJTNi/abc_worksheets_coloring.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384142/normal_5fcd2f1574653.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366048/normal_5fe5ef1802eaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421466/normal_5fd670c6d78b5.pdfIn PDF document text
    • https://dubebonu.weebly.com/uploads/1/3/0/8/130874554/wujiwuz-rukemowowumaj-wutomokas.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/034ce709-b138-43eb-beda-c1f56a092b57/how_bad_is_covid_in_san_diego.pdfIn PDF document text
    • http://waxedejav.epizy.com/baldurs_gate_2_switch_coop.pdfIn PDF document text
    • http://kojomazudogog.epizy.com/lawavevok.pdfIn PDF document text
    • http://satanira.rf.gd/game_design_merit_badge_book.pdfIn PDF document text
    • http://rofarodet.rf.gd/20885397357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00614122-40b4-4253-aa89-684affa707f6/ccna_collaboration_training_in_bangalore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f655f086-256f-48cc-adcb-95a0fc0c6e8a/crime_prevention_through_environmental_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f73e3a01-4384-46f8-bbbe-f6e72faa840c/what_does_english_comp_2_consist_of.pdfIn PDF document text
    • http://lejajalosifoler.epizy.com/bizunanobekedon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cd903da-91fd-4ff0-8299-1155035215ef/hp_elitebook_6930p_datasheet.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_off0000daa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA2 5132 bytes
SHA-256: 878d59bbb5de87e3dd881679d80bb3a783b32304e59e5bc68fe8bdde4b469773
font_01_sfnt_off0000ebec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 11444 bytes
SHA-256: 4ef27dcc6caf3179c3200d967817f242ab5dcc404583aa7fadd728bb6db20db2