Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8d141d4e443700…

MALICIOUS

PDF

76.2 KB Created: 2020-12-28 20:51:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 0b504277eea263388e4d2e91d4ce14a2 SHA-1: 7719bfcaaffe3179287c55ae095bb855b1f91bbd SHA-256: ae8d141d4e4437005baa11d97e5e4ec4d361413b4dd47138ac4ed04fb5e36eee
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many of which are part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to mimic an invoice or payment request, encouraging user interaction with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://trafffe.ru/aws?utm_term=alstonia+boonei+pdf PDF link annotation
    • https://cdn.sqhk.co/salenasova/jhjcvjd/rokoguwanapo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491148/normal_5fabf646f2e0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389570/normal_5f964868b5b6a.pdfIn PDF document text
    • https://finejorokisitoj.weebly.com/uploads/1/3/4/4/134495390/6824838.pdfIn PDF document text
    • https://wuvepudikuj.weebly.com/uploads/1/3/4/7/134731811/kemujuxaro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_5f9131066d18d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476418/normal_5fe6dad2afb24.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
    • https://s3.amazonaws.com/jaxesabi/beehive_class_9_chapter_5.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/25655547727.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/jirojevidomop.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/email_invoice_template_opencart.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/24055125488.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/64405491768.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/xixobonejinususazu.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_off0000e082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE082 4856 bytes
SHA-256: a09caa529e1a4708af9bcfc8c71a9bb8ce24dd75d1512d44b4149cb79221fd8f
font_01_sfnt_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 10876 bytes
SHA-256: 4cc9f9eb946b89408a9bbfd9afc8a1e1fc1259b2413687d2eb79020b5074fd68
font_02_sfnt_off000115d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D9 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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