Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0d7a793cb91166…

MALICIOUS

PDF

80.9 KB Created: 2021-06-04 08:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fe852dd9917f1a916e30f0739a2de45c SHA-1: 90109c634be8a40e5e3a6e79f1c64ef910c3719c SHA-256: 5c0d7a793cb91166854c60fd8dabac4c051e38e70030b1ec8054d55a35b88e19
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation scheme. The presence of URLs like 'https://jottigo.ru/123?utm_term=bet+365+apk+2018' indicates a potential lure for users interested in specific content, possibly related to gambling or fake applications. No scripts were extracted, but the PDF structure itself is used to host and redirect to these external resources.

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://jottigo.ru/123?utm_term=bet+365+apk+2018 PDF link annotation
    • https://desaboros.weebly.com/uploads/1/3/5/4/135400021/9430358.pdfIn PDF document text
    • https://wukajimodowel.weebly.com/uploads/1/3/0/8/130874313/bomiruvo.pdfIn PDF document text
    • https://xenezukuxitolap.weebly.com/uploads/1/3/4/5/134528427/53cc919d6e3.pdfIn PDF document text
    • https://pegugigatusib.weebly.com/uploads/1/3/4/4/134460290/vulurubifovekovepetu.pdfIn PDF document text
    • https://nanewibogexuro.weebly.com/uploads/1/3/1/3/131382113/mamejetofi.pdfIn PDF document text
    • https://bepifesak.weebly.com/uploads/1/3/4/0/134096259/26647.pdfIn PDF document text
    • https://jejofiwapo.weebly.com/uploads/1/3/5/3/135312812/02b630ec30117c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453102/normal_601855799ff1d.pdfIn PDF document text
    • https://libuxematofep.weebly.com/uploads/1/3/1/0/131070581/2837064.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417216/normal_5ff779862e074.pdfIn PDF document text
    • https://dakubazelup.weebly.com/uploads/1/3/1/4/131454222/dezas-zolipitusasas-duxefopifupufeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382201/normal_5ffdb7de129d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rugewenuzed.pbworks.com/f/how_to_set_up_signature_in_nuance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72ee11da-3aa5-4eeb-badf-4764222baa50/honda_generator_eu3000is_service_manual.pdfIn PDF document text
    • http://vawaguzidatu.pbworks.com/w/file/fetch/144591060/pagazav.pdfIn PDF document text
    • http://zuvevetub.pbworks.com/f/wavlink_300mbps_wifi_range_extender_setup.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/f/malemobugulufudezidino.pdfIn PDF document text
    • http://goxeguj.pbworks.com/w/file/fetch/144575607/how_do_i_program_a_universal_rca_remote_control.pdfIn PDF document text
    • http://zupelapowi.pbworks.com/f/how_many_calvin_and_hobbes_comics_are_there.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcfc0d31-001e-46c0-894d-a1ac1f0f07cf/dcs_world_mission_editor_manual.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/f/gobotagalarug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72dc18cb-4701-4037-b5e1-b4dae7dab11c/how_to_pair_jabra_elite_65t_with_macbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccb08aa3-745a-430a-9269-6db73238963f/faguwowo.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_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 5584 bytes
SHA-256: d3a74ad5e13e27e81bc2e321b0454377a861438765f4339125cbb79469304c7e
font_01_sfnt_off00010edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDB 11328 bytes
SHA-256: 1789841875e94d492be7d8060f257a7ef0dd148a37e77500a2cfb1be5c8080ad