Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b36fc12d171ec7e…

MALICIOUS

PDF

75.1 KB Created: 2021-04-08 00:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 392bdf26626ac9bf72fcf323036f2aab SHA-1: 82d3397f775a9fefbc1f9de39c692407e459d259 SHA-256: 8b36fc12d171ec7e95b50cb57e917a4de170794fcf78a9fd19c6fae93fafa20d
156 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 0.9998

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 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.
  • 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://dafemum.ru/wix?keyword=how+to+count+sigma+and+pi+bonds+in+a+lewis+structure PDF link annotation
    • https://webojese.weebly.com/uploads/1/3/0/9/130970005/tujemibugi.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/hWdjePI/up_hill_race_2020_results.pdfIn PDF document text
    • http://busivel.xyz/cyclitic_membrane_formationc8ul4.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CKsihKb/40504930244.pdfIn PDF document text
    • https://fozaronu.weebly.com/uploads/1/3/5/3/135349809/e9bd7884a52141.pdfIn PDF document text
    • https://cdn.sqhk.co/joduragenep/dgOhgtz/bajuniboxiw.pdfIn PDF document text
    • https://warogowi.weebly.com/uploads/1/3/1/6/131606132/3394924.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/80442839902tlmmc.pdfIn PDF document text
    • https://cdn.sqhk.co/sekigizakeku/hjDhbhj/city_of_toronto_ward_lookup.pdfIn PDF document text
    • https://cdn.sqhk.co/sunawopi/diaiggj/north_star_casino_win_loss_statement.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zonivezada/pifovifexinemod.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/sozituzolerifuden.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/nesuzixozejejitixakota.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/why_is_the_classical_period_called_the_age_of_reason.pdfIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_9664ba090d12450caf68e9afe3385158.pdf?index=trueIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_31d71cdca66f45e0824f2e71f3943798.pdf?index=trueIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_3b5a64def1734193be8f4fd44d294a32.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/blackberry_classic_whatsapp_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/metodologia_auditoria_de_sistemas_informaticos.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_off0000e5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B5 5584 bytes
SHA-256: ff03b8f5027e3ab7d8c147f511d472da6c04474117dd8fb764d097ff8e2b609d
font_01_sfnt_off0000f8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A5 11076 bytes
SHA-256: f67ccebae07ae90804c44d315254adffa2ac5f92b5bc8b703082100a0d6d5ed1

Open this report in the interactive analyzer, or submit your own file for analysis.