Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae17199ac7df68f0…

MALICIOUS

PDF

70.3 KB Created: 2021-01-08 07:49:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3859c3f51c569d264a639024c19c748c SHA-1: b368c8e4f7846a213a779ebf4bba6cc8178e645b SHA-256: ae17199ac7df68f04b70291aac47ae70e97f7ab92302cd6f33cf4c0b42713fe0
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The embedded URLs are likely used to redirect users to malicious sites for credential harvesting or malware distribution.

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://trafftec.ru/123?utm_term=learn+c%2523+in+one+day+and+learn+it+well+c%2523+for+beginners+with+hands%25E2%2580%2590on+pdf PDF link annotation
    • https://jobovivubip.weebly.com/uploads/1/3/5/3/135392816/2960646.pdfIn PDF document text
    • https://logekififej.weebly.com/uploads/1/3/4/5/134502341/b9eba5.pdfIn PDF document text
    • https://fadefewili.weebly.com/uploads/1/3/4/3/134316521/vewanadadaxefufuzu.pdfIn PDF document text
    • https://nokuzase.weebly.com/uploads/1/3/4/7/134765685/2710424.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492918/normal_5fed6dc4b9dbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500201/normal_5fbade6b0cd71.pdfIn PDF document text
    • https://ganulexotugoris.weebly.com/uploads/1/3/1/1/131164012/vuzavawudufajegu.pdfIn PDF document text
    • https://xoregofejaba.weebly.com/uploads/1/3/4/6/134651656/dapozafiwuxi.pdfIn PDF document text
    • https://niliwuwez.weebly.com/uploads/1/3/4/2/134265541/kexokiwoposepuwinin.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/10ad1613-c350-4a7a-8afc-bda43b883540/nogodigisivigiwitalo.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/bukidoloruvonada.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/wenumaledobevog.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_off0000d75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75A 4524 bytes
SHA-256: daa24b3aef1ccd9917be4ee1c36793cb8dd132e3bcc237585551b92eb3ddbfc7
font_01_sfnt_off0000e6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CE 10908 bytes
SHA-256: 290e91fd24aab8e477672cce8b4d2fec744b90df1e926a612896eb9ee6c3491e

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