Malicious PDF — malware analysis report

Static analysis result for SHA-256 1592993b880a37d3…

MALICIOUS

PDF

77.2 KB Created: 2021-03-18 20:33:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5e8c32049ba005e3c536efcc3554c210 SHA-1: d3aeadfcd3597aee5571a48f12647d022546bb63 SHA-256: 1592993b880a37d34290543a202a8423630f845f89553bafe44607f9878ac680
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation attack, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/award?keyword=windsor+castle+history+pdf PDF link annotation
    • http://fevinoreniwelik.sportsontheweb.net/vuwewefovanutimulalexipig.pdfIn PDF document text
    • http://bimoriz.getenjoyment.net/falepufokunixepegisokuru.pdfIn PDF document text
    • https://vawuzusafut.weebly.com/uploads/1/3/4/8/134863851/belizibatureviparu.pdfIn PDF document text
    • https://cdn.sqhk.co/bejadelu/giiaOgh/bopifasifexid.pdfIn PDF document text
    • https://dumamawikop.weebly.com/uploads/1/3/0/7/130740251/8523959.pdfIn PDF document text
    • https://sizegetode.weebly.com/uploads/1/3/4/3/134309939/tulido.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/wonder_weeks_leap_10_milestones.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/96414100582.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/ACggewq/jorudamuzumoj.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/ibWija6/10632034369.pdfIn PDF document text
    • https://kalepadakib.weebly.com/uploads/1/3/1/6/131637037/bireluzaled_dopijimok_bumanapirigop.pdfIn PDF document text
    • https://gibegijatu.weebly.com/uploads/1/3/5/4/135400332/8695185.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/jbUIhhF/wordsmith_or_wordsmyth.pdfIn PDF document text
    • https://cdn.sqhk.co/digipexula/ijhJVje/how_do_you_draw_gacha_life_hair.pdfIn PDF document text
    • https://cdn.sqhk.co/butituguxur/ihY6Eie/93660658489.pdfIn PDF document text
    • https://cdn.sqhk.co/tamupoto/4uibShf/descargar_my_little_pony_harmony_quest_apk.pdfIn PDF document text
    • http://xorimomupajo.scienceontheweb.net/95346439472.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/a23939b7-a7ee-4e07-a4ac-eedf3e35c705/head_first_design_patterns_updated_for_java_8.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/exotic_weapons_division_2_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa028cff-05ab-4c70-8676-ba756328dcae/diablo_3_reaper_of_souls_ps4_digital_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23d8a899-f55c-4de9-8be6-36d65aa6f886/what_does_a_head_of_client_services_do.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/coesia_annual_report_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5b3d32c-7654-4a22-baeb-d9b98362af86/good_night_gorilla_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a09680f-ac78-4f55-af2b-f72ede3cb1c3/15397574693.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_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 5360 bytes
SHA-256: 8c5a80cfbdec327262834d5ba7610790121371300c5ffded55c2eb0cd7b34779
font_01_sfnt_off00010455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10455 10388 bytes
SHA-256: 6a43f971b821007a1082f8ba872b9d05c5a02c792173849512ddd42b3904be55