Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9acc075cbf806a…

MALICIOUS

PDF

81.7 KB Created: 2021-03-25 17:19:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c9ad65d79b9baba934e79e806a1ea3df SHA-1: 28d055192e8d68b230e6965d37b5b65aac872fcf SHA-256: cb9acc075cbf806aaa154031549dac0ec5ed35da7ecb2b118364728a8482994f
146 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs pointing to disposable domains, suggesting a link farm used for phishing or distributing further payloads. The presence of PRC/3D content is also noted as a potential exploit vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://kuzutuzo.ru/123?utm_term=project+cost+estimation+template PDF link annotation
    • https://jedurabononip.weebly.com/uploads/1/3/1/4/131453193/ledobufo.pdfIn PDF document text
    • http://naturfresh.space/dafuvajadovigomy60a.pdfIn PDF document text
    • https://miwolugakibu.weebly.com/uploads/1/3/1/3/131383652/bebadixa.pdfIn PDF document text
    • https://cdn.sqhk.co/kobadaxo/haniaha/21139916235.pdfIn PDF document text
    • https://liwavijej.weebly.com/uploads/1/3/4/3/134379327/gamutut.pdfIn PDF document text
    • https://cdn.sqhk.co/suwajipufo/2hjashe/fowosuvotomel.pdfIn PDF document text
    • http://clientbluebadge.com/zimamij0uw35.pdfIn PDF document text
    • http://1offpark.xyz/2266296450bt4hg.pdfIn PDF document text
    • http://bigowet.xyz/todo_list_application_in_android_studioq5qrq.pdfIn PDF document text
    • http://wigogaduxatinuv.iblogger.org/html_template_responsive_gallery.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/6362593.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wagadepepixapu.epizy.com/astron_power_supply_schematic.pdfIn PDF document text
    • http://lipaxunuvevi.epizy.com/88363022522.pdfIn PDF document text
    • http://mofobasu.rf.gd/5679982210.pdfIn PDF document text
    • http://roxegut.rf.gd/polycom_hdx_8000_installation_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 4944 bytes
SHA-256: 6d29cdcb60f2723aad16576caa4e098c6a21dc10385a4ccb05666027e21f4155
font_01_sfnt_off000107da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DA 10416 bytes
SHA-256: 6ae4d61f34083fb53bb1be7e87723c0757a8745dee65ade2b3bb3fedebaecc61
font_02_sfnt_off00012b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B59 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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