Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5f7538b21b9777…

MALICIOUS

PDF

66.0 KB Created: 2021-02-24 11:31:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 494a488ac00c941aecba55d50ee5f781 SHA-1: 700eece62424dd170f9d4dfe5c9720f0162f496e SHA-256: bb5f7538b21b97777c7a133b83f52abe52238af204f7623fb7bf57b6e49485a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://leonvi.ru/aws?utm_term=briggs+and+stratton+8+hp+engine+repair+manual PDF link annotation
    • http://tokio-2020.fun/zoxikejulorezefowukewutsylcw.pdfIn PDF document text
    • http://ketosimple.online/27789838554q9liz.pdfIn PDF document text
    • http://sunshop.pro/gedupisefujaku6zdfs.pdfIn PDF document text
    • http://lumacy.site/rotating_skyscraper_in_dubaiz33av.pdfIn PDF document text
    • http://winwites.space/bright_dot_in_skyxwinq.pdfIn PDF document text
    • https://kifeketefisub.weebly.com/uploads/1/3/5/3/135347095/f72215d36.pdfIn PDF document text
    • http://kushtanash.ru/salapmv6r0.pdfIn PDF document text
    • http://1ux.site/92537702256r9c03.pdfIn PDF document text
    • https://litaxavuve.weebly.com/uploads/1/3/4/8/134848922/7588011.pdfIn PDF document text
    • http://vknart.xyz/vuruviburimosedukozuperaq11.pdfIn PDF document text
    • http://armlur.space/bejijobijexefoujs5y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kediditu.rf.gd/99277184915.pdfIn PDF document text
    • http://tixefol.epizy.com/43058176023.pdfIn PDF document text
    • http://vajipiposugeto.rf.gd/wemuzefulaxemobuvi.pdfIn PDF document text
    • http://sedoguzod.rf.gd/raynor_garage_door_sensor_problem.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/86235984871.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/16552273235.pdfIn PDF document text
    • http://mozutebileba.rf.gd/figezofegonefudofunavas.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/tezivefularaxonu.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_off0000c581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC581 5616 bytes
SHA-256: e5955d58fb63eb6aa2d427479e31fe0abe0710958a214240d416b1f58a2d8550
font_01_sfnt_off0000d869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD869 9996 bytes
SHA-256: c34b1922ec0987a99a6a2ae697fd2f53300cb7e0a8a7d79d800d43608d5430c0