Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24a0da72c4556ea…

MALICIOUS

PDF

75.8 KB Created: 2021-02-16 00:00:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 920c485972f7acb79b3711f302468ac6 SHA-1: 5bfc623f3977cc4e9cf8a95b7fb43f173a312b12 SHA-256: b24a0da72c4556eaaed2ba8ccfbbc1b81cca205446814aae2b8048307c01571e
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wix?keyword=meat+guide+book PDF link annotation
    • http://wokulorumal.iblogger.org/46804908374.pdfIn PDF document text
    • https://cdn.sqhk.co/geroterunetu/hVifkX5/13514881498.pdfIn PDF document text
    • https://rulovuwupe.weebly.com/uploads/1/3/5/3/135386045/nuzadami.pdfIn PDF document text
    • http://gifozuxozud.22web.org/awal_speaking_english_video.pdfIn PDF document text
    • http://turoliwejaxafux.22web.org/pazilumagavozojipum.pdfIn PDF document text
    • http://newoxinap.66ghz.com/reporter_vacancy_new_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wogosozado.rf.gd/duracell_procell_aa_datasheet.pdfIn PDF document text
    • http://vezufokat.rf.gd/17425950756.pdfIn PDF document text
    • http://patemud.epizy.com/18043773921.pdfIn PDF document text
    • http://xaviwawav.epizy.com/nibuva.pdfIn PDF document text
    • http://puzenufamem.rf.gd/kinuvusawesuzujewozuz.pdfIn PDF document text
    • http://bosadubarelazu.rf.gd/what_does_fortnite_run_on_quiz_answer.pdfIn PDF document text
    • http://mibexumobanoko.rf.gd/27901652593.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_off0000ee36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 4896 bytes
SHA-256: 544b9cf376b31960c4b445dbb58dfe295117e067c33186b2a41a4cb922ecad3b
font_01_sfnt_off0000ff03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF03 10408 bytes
SHA-256: 4bc60603b93ca9c6cf071ff3aa26f9d7082227dc5a94606c364cd0456042fc82