Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a1f62dc5344974…

MALICIOUS

PDF

77.2 KB Created: 2021-04-14 11:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 87c9343e4f9b52bb88339fa79fac1b20 SHA-1: 957266e3bd04de08ef535c8feef7f20f485fac81 SHA-256: 67a1f62dc5344974e8911d4017159d3a5e14b445e7b8f9b1f35c9a776c936856
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 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=importancia+de+las+inteligencias+multiples+en+la+educacion PDF link annotation
    • http://dorightpress.com/68841046426bbold.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/78711189478hm5eh.pdfIn PDF document text
    • https://kemewekodu.weebly.com/uploads/1/3/1/8/131857474/6723969.pdfIn PDF document text
    • https://kowijifeno.weebly.com/uploads/1/3/5/3/135390944/b7a245cbb448bff.pdfIn PDF document text
    • https://salogisamokowo.weebly.com/uploads/1/3/4/6/134649366/kopilibejugozawisu.pdfIn PDF document text
    • http://hs-life.ru/sociological_imagination_analysis_which_factorsqqy7p.pdfIn PDF document text
    • http://usejus.club/pejibezufupanobodutetsf4sa.pdfIn PDF document text
    • https://likifovufuli.weebly.com/uploads/1/3/4/5/134588617/6018474.pdfIn PDF document text
    • https://zupuxugemewizo.weebly.com/uploads/1/3/4/3/134309945/5046296.pdfIn PDF document text
    • http://hiziryigit.online/lipokibopitaefmk3.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/8ce956cd-3100-42be-bb2a-6bf8e3dd3232/zulifovumaretapexebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9641a289-42cf-4e73-8bad-7cfa54c0934a/how_to_program_a_universal_remote_to_a_roku_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2fe3064-13c5-4727-bdf6-46d562d13ba4/fonobasofedonakifit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/718ddf1a-20fb-404b-a7a7-ced75ebcfa44/19957287169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b35d8bd4-85e6-45bc-93b4-32a3f05f68bf/hibernate_tutorial_java_code_geeks.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/heat_n_glo_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/did_the_plane_really_crash_in_wolf_of_wall_street.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c624e2b-99c7-47f4-88ff-b49a718bccd2/que_es_un_genero_literario_dramatico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2548392-ea9c-4a0f-99c8-7f6c129fd3fb/casio_exilim_battery_np-80.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/879a750c-7b4f-45fc-a525-a2d4b0ae6979/vemesajobuwoxekelexiwogig.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/new_movies_hd_bollywood_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/valentine_movie_indonesia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47bd498d-2a4b-48e8-beeb-9596271413ed/38658505266.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/google_analytics_reporting_api_tutorial.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_off0000ecb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB4 5328 bytes
SHA-256: 1d71d63f5d014f5b994d30354e939044c1a6bae62486ecc92fdc7ee450ef4763
font_01_sfnt_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 11880 bytes
SHA-256: bb9dc7e3123a1411d7918b88fe3e1e49de64080c515914ec219e5aaa4099443b