Malicious PDF — malware analysis report

Static analysis result for SHA-256 9166d153574e57aa…

MALICIOUS

PDF

67.8 KB Created: 2021-03-02 11:53:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5d86f9e02674da0103d70f8920024263 SHA-1: f65f0bcc050163108397858aca5c0d455ee46056 SHA-256: 9166d153574e57aa93b9e9c931fb09ddf22a4070cdaa586c989538b1718be30e
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://baarspo.ru/123?utm_term=bosch+axxis+condensation+dryer+won%2527t+start PDF link annotation
    • http://organicsss.space/396804398052l683.pdfIn PDF document text
    • https://cdn.sqhk.co/fusajovogi/wdII3ge/toolbox_widget_socket_organizer.pdfIn PDF document text
    • https://lokanasa.weebly.com/uploads/1/3/5/2/135299929/wikirofupoja_batozazukomu_wogiwadosexixu_pukeduwaw.pdfIn PDF document text
    • https://dafepigog.weebly.com/uploads/1/3/4/6/134605944/580d20182a.pdfIn PDF document text
    • http://tipografiyav.moscow/lizapedigt1b03.pdfIn PDF document text
    • https://padawevuwelidas.weebly.com/uploads/1/3/1/4/131438111/19c34c7828.pdfIn PDF document text
    • https://depumubawaminuk.weebly.com/uploads/1/3/4/2/134236244/wefuxepetami.pdfIn PDF document text
    • https://cdn.sqhk.co/tazewupo/iaPxqj1/archery_bow_press_canada.pdfIn PDF document text
    • http://wbigs.space/divozelapevijiljivnd.pdfIn PDF document text
    • https://cdn.sqhk.co/nozelenid/LKNAjeU/happy_birthday_cake_pic_with_name_and_photo.pdfIn PDF document text
    • http://ductsunlimitedins.com/cofunction_identities_worksheet_with_answersx5yo4.pdfIn PDF document text
    • https://sowematawenuw.weebly.com/uploads/1/3/1/1/131164153/biroxenoxajefuve.pdfIn PDF document text
    • https://cdn.sqhk.co/fezavomol/OGjeNib/26398941873.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wepezip.epizy.com/89885541926.pdfIn PDF document text
    • http://xalesikejuxo.epizy.com/34956295122.pdfIn PDF document text
    • http://reronagut.epizy.com/baldurs_gate_2_multiplayer_waiting_for_information_from_server.pdfIn PDF document text
    • http://bodapefazit.rf.gd/bluecoats_uniform_2019.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_off0000cd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7E 5340 bytes
SHA-256: 12fecc5560fc4a46806d426f4a28f7dc9d7ab6974156db64290025051c26ad55
font_01_sfnt_off0000dfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC4 10048 bytes
SHA-256: 139a3b1ea58052f87f1d22fdc64a7d1a232cb92771eb5ad08ce8a45416235d37