Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b34e12fd4221e3…

MALICIOUS

PDF

69.0 KB Created: 2021-04-04 09:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 906d995075e745c64427e5c756a69e0d SHA-1: 55f0734d5a0f41d5a315133aa0a7541a241f3645 SHA-256: a7b34e12fd4221e30b644e3f8b1cafc79f7f58f0ed2640080d8814f60aa2ebbb
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 0.9997

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://ponafet.ru/award?keyword=ciencias+sociales+santillana+pdf PDF link annotation
    • http://trynon.xyz/bsf_questions_and_answers_lesson_25_day_3uyx10.pdfIn PDF document text
    • http://tameeniraq.com/vijekigenogipivufejetijbmf9p.pdfIn PDF document text
    • http://noncomform.space/zafozufevabinusuabn57.pdfIn PDF document text
    • https://tatedugede.weebly.com/uploads/1/3/4/3/134311852/gesegowefibasamex.pdfIn PDF document text
    • https://zesadokalefon.weebly.com/uploads/1/3/2/6/132681767/winukukudisoki-lakekozafan-misege-bikemaz.pdfIn PDF document text
    • https://dixosejut.weebly.com/uploads/1/3/1/8/131857981/5780394.pdfIn PDF document text
    • https://xegunato.weebly.com/uploads/1/3/4/3/134315925/5114729.pdfIn PDF document text
    • http://qrastenmap.online/511507644370wn9d.pdfIn PDF document text
    • http://choosenews.space/hope_charter_schoolynvny.pdfIn PDF document text
    • http://podcard2020.site/72524976234i3tr0.pdfIn PDF document text
    • http://about-fb-support.com/red_and_blue_flag_with_suncdyl2.pdfIn PDF document text
    • http://nefritthebestthing.site/analysis_of_the_short_story_harrison_bergeron1gvyw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://noborixujap.epizy.com/47118294794.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/c_o_c_mod_apk_hack_version.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/alchemy_and_herbalism_guide_wow_classic.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/35118811707.pdfIn PDF document text
    • http://vibiputis.epizy.com/nuripobijurufiz.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/71881085399.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/92989239630.pdfIn PDF document text
    • http://vilusosexar.epizy.com/format_factory_filehippo.pdfIn PDF document text
    • http://savunibuguk.rf.gd/gopomulafowadubapof.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_off0000d047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD047 4960 bytes
SHA-256: 3bb231be9c8563f7e3e3ce9cd028f1ab81e32c7c7e8658c08c96a4ddf1d2b95c
font_01_sfnt_off0000e13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13A 11104 bytes
SHA-256: ca49df74c0fe69931ad3462f45a14436a3b16bbd83365454d8dd7b91b4dcfd51