Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8fea02146563f5…

MALICIOUS

PDF

76.8 KB Created: 2021-03-12 05:43:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 932cdd68496fc4902df177593cc69087 SHA-1: 5d3c3dc42979e3e153231992d818f83538a1f610 SHA-256: fb8fea02146563f59659d03335eef8216437331ef2b49913d1624f23074b79d5
66 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and metadata suggesting it is part of a link farm designed to redirect users to malicious sites. The ML classifier strongly indicates maliciousness, and the presence of external URIs points towards a phishing or redirection attempt. No scripts were extracted, but the overall structure and URL usage are indicative of a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://lozipotod.ru/strik?utm_term=is+kyoshi+the+strongest+avatar PDF link annotation
    • http://taniduvubaz.22web.org/pimetexo.pdfIn PDF document text
    • http://podeves.xyz/disney_world_parade_2020g2r3g.pdfIn PDF document text
    • http://dikiradojasika.iblogger.org/vuletijotoneralifapi.pdfIn PDF document text
    • http://stnold.com/andrew_cardwell_rsi_course13m2i.pdfIn PDF document text
    • http://jepegupunu.mygamesonline.org/gazeduni.pdfIn PDF document text
    • http://instapriz.online/85742608740bhr83.pdfIn PDF document text
    • http://whitetwo.space/10020810241q6h9y.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/conan_exiles_purge_mapnn82e.pdfIn PDF document text
    • http://webmastervlad.ru/semuwarapj17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/bovapejose.pdfIn PDF document text
    • http://kapirexazi.onlinewebshop.net/difaxabakelanes.pdfIn PDF document text
    • http://supabije.rf.gd/75224503582.pdfIn PDF document text
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_b5d74fd24b6c4365a4959f2e45a328d8.pdf?index=trueIn PDF document text
    • http://zunuwovadete.epizy.com/mifenanexisulexebukasufi.pdfIn PDF document text
    • http://wobanunep.myartsonline.com/63374877483.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/nonexofejotepuzoto.pdfIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_efb75c94862a47b2ae14042ea88c9093.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/satudifin/behavioural_activation_therapy.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_off0000f146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF146 5080 bytes
SHA-256: b3c75297073b58ee4807f20d876b802783a4b47458055d5b358934999559b8b4
font_01_sfnt_off0001029b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029B 10420 bytes
SHA-256: 390b7dec0cc6d6f08c63bf3ea0e5c4927900300a7c147181e09cd07c0a2f7124

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