Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb945e22380771fb…

MALICIOUS

PDF

82.1 KB Created: 2021-03-19 17:53:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e576a630d09308d32077cc00fd5b0e8b SHA-1: b2555dfbf94012faf7a645837ad6dd7af135fb31 SHA-256: fb945e22380771fb53b239b2cc698a80fb25940c4ce9f2275bc2ea180916f6dc
206 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The document body, though malformed, suggests a lure related to downloading a movie. The presence of a malformed exploit stream and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/wix?keyword=superman+vs+batman+full+movie+download PDF link annotation
    • https://fakipaga.weebly.com/uploads/1/3/1/1/131163599/7795442.pdfIn PDF document text
    • http://ladekepevij.mygamesonline.org/wudejolanasakus.pdfIn PDF document text
    • https://tagizolatoz.weebly.com/uploads/1/3/5/3/135311358/c701acf8f4156.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/analytical_geometry_grade_12_download.pdfIn PDF document text
    • https://nolaxefipox.weebly.com/uploads/1/3/4/7/134740184/kuxugivalesaminozili.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/qCyRcJP/fdic_call_report_glossary.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/jeghghj/tap_titans_2_best_artifacts_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/gcgiKzq/to_do_list_application_in_javascript.pdfIn PDF document text
    • https://kivisibef.weebly.com/uploads/1/3/0/7/130775328/dozawuzujugix-daliwur-natomu-ruruvujepe.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/how_to_repair_washing_machine_that_wont_spin.pdfIn PDF document text
    • http://warixedivukinat.mygamesonline.org/buttermere_walk.pdfIn PDF document text
    • https://cdn.sqhk.co/melalisopapu/bghn2je/tipipuxirizubinuloju.pdfIn PDF document text
    • http://fuxisileza.mywebcommunity.org/horn_antenna.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/X0RgcHS/geravu.pdfIn PDF document text
    • http://xonitaj.mywebcommunity.org/terosasepokitaselaniwigob.pdfIn PDF document text
    • https://manoxumumaxu.weebly.com/uploads/1/3/4/4/134472756/kobis-mijigisep.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/ggtKREV/fubinanatopazafomapugajo.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/agi1pTF/pewaderelivokus.pdfIn PDF document text
    • https://cdn.sqhk.co/pujazojiwixi/NAPhjGN/rajibupufotix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_ce328e2a94af4ae3b01fcc58250d15ec.pdf?index=trueIn PDF document text
    • https://d6504552-49b0-4b7d-b1ff-94f9e1082b83.filesusr.com/ugd/1f0558_7bce723488a64486a8d6910fffa2dabb.pdf?index=trueIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_59c7f925a3a847998826415c0101e1d5.pdf?index=trueIn PDF document text
    • https://e9542b43-fb79-4c62-94a9-c66526381fce.filesusr.com/ugd/4142f3_746cc164fcf64971b0a9602159efdfd8.pdf?index=trueIn PDF document text
    • http://lapetagalelan.myartsonline.com/bimamutogitepas.pdfIn PDF document text
    • http://samajusinifako.atwebpages.com/gokuvekizorabupuloganenud.pdfIn PDF document text
    • https://c38d9960-f3a4-46a0-b266-cfc7836dd0ed.filesusr.com/ugd/a8d9c8_9028f37b84ef4f93b93ec5d1f0db3be9.pdf?index=trueIn 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_off00010166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10166 5580 bytes
SHA-256: 39c343e40ed096c790f27216a5481d756f850a6f801a3bd7369c4161a0c0392a
font_01_sfnt_off0001144f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144F 11160 bytes
SHA-256: b7b10db2fa4f1ef6bb9cf03e5481feb1b45fcc33ba0c15a543786bf384abfef6