Malicious PDF — malware analysis report

Static analysis result for SHA-256 a812bf4a5bacbd1b…

MALICIOUS

PDF

75.8 KB Created: 2021-06-01 13:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 49bc762ebd4e25275bbb79c774021721 SHA-1: 7284b8c0732dafb24b2713ee94d298b3bddab58c SHA-256: a812bf4a5bacbd1b28eaf80f679abff32773ffb131179f73d7be85a4d48d87bf
186 Risk Score

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://allytemp.ru/pbw?utm_term=can+someone+hack+your+cash+app+with+your+email+and+cashtag PDF link annotation
    • https://bebezirowud.weebly.com/uploads/1/3/4/3/134371107/muvefiroxexosas-jajaxigurewexol.pdfIn PDF document text
    • https://tajurasexir.weebly.com/uploads/1/3/1/6/131606020/6416097.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422884/normal_5ff0f31d99138.pdfIn PDF document text
    • https://kisogegexene.weebly.com/uploads/1/3/4/3/134374262/36978.pdfIn PDF document text
    • https://vadekelovade.weebly.com/uploads/1/3/4/3/134372386/1042da2bdb1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451228/normal_60017ac5990bc.pdfIn PDF document text
    • https://paniwotipetusu.weebly.com/uploads/1/3/4/6/134614288/nazoradeje-lujupu-fajagetexesigu-xenepa.pdfIn PDF document text
    • https://gogiwujuduk.weebly.com/uploads/1/3/4/3/134352159/xitijoniv-pononev-zegobu.pdfIn PDF document text
    • https://refiraledekire.weebly.com/uploads/1/3/4/7/134715744/mukefawirewu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476445/normal_5ffb4b2561804.pdfIn PDF document text
    • https://jipafopabos.weebly.com/uploads/1/3/3/9/133986828/fojavejus_fipibibo_tepalatosuv_tetoka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443341/normal_5fd8d9b458605.pdfIn PDF document text
    • https://sexiguviwuzokal.weebly.com/uploads/1/3/4/6/134687255/3792274.pdfIn PDF document text
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/8360455.pdfIn PDF document text
    • https://pejejejepo.weebly.com/uploads/1/3/2/6/132682076/4882259.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e889dadc-db37-4bd6-abdb-3c55cab7a52a/toyota_automatic_transmission_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a759d1f5-2e60-4f53-b2ad-0043dc7bc072/descargar_libro_de_robertis_biologia_celular_y_molecular_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49237775-12a2-448e-8c6e-91257374801f/apk_bri_mobile_versi_terbaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05bb8dc9-c508-4143-80b7-2e19e526a44d/tanegixodogupagos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae22f111-6d7f-4ff6-99bc-1b123413d430/kalimba_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0ad848b-988b-4161-a9c1-bb68837eff7c/87383288123.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_off0000e975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE975 5652 bytes
SHA-256: 3ff789b5875b532c884bac8a67c4fe482420ff94c6a25c9b5ac42285962799fe
font_01_sfnt_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 10928 bytes
SHA-256: d2c904f066a541bfb5f31d843c4ce123ef5995590c999f887d1de569e7037d8f