Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f946a9e7845161c…

MALICIOUS

PDF

67.6 KB Created: 2020-11-10 07:44:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 9771cf5128e6a8d58670cab85b720fcd SHA-1: 797a116e6d08cf7a3d15fe4c684a1ecf2097aa87 SHA-256: 1f946a9e7845161cd28deb6cc9932554398f45941c142d93ea1b7ce716145b96
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs, such as 'https://traffset.ru/strik?keyword=the+defining+decade+pdf', are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/strik?keyword=the+defining+decade+pdf PDF link annotation
    • https://lipitedo.weebly.com/uploads/1/3/4/3/134380968/kikafewojuv.pdfIn PDF document text
    • https://worofinuwur.weebly.com/uploads/1/3/4/5/134582463/8311168.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/55331fb9a2e434f.pdfIn PDF document text
    • https://zevamomarage.weebly.com/uploads/1/3/4/6/134611313/kevogokinul.pdfIn PDF document text
    • https://dozasasakebo.weebly.com/uploads/1/3/1/1/131164234/b2a68aaade2.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/7523553.pdfIn PDF document text
    • https://fukikabigo.weebly.com/uploads/1/3/4/4/134457586/bb86ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369762/normal_5f8a0f6babb73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_5fa1f0e41a38b.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/94bba8b9-f581-411e-b2a2-6e05d9f01414/pawalujomizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceaee688-972c-4f05-95c7-3a3eb0153e35/paboxefazopufuwedidamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/604a85ac-93e9-477a-ab5d-0ab9cdbcee6e/watch_weathering_with_you_dubbed_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3c7491d-3196-483b-bba8-44828512176d/bazezokisa.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_off0000cb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB84 5060 bytes
SHA-256: 88830d0196b02e37cd1aa0045dc7484146018b17a2da40f7d2973ca469f3e797
font_01_sfnt_off0000dcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC2 10908 bytes
SHA-256: 040c37a3858cd05b6ffd54d350b5965f64e6e81634449f83d11b7b88b4312339

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