Malicious PDF — malware analysis report

Static analysis result for SHA-256 1494344b7a8e2ade…

MALICIOUS

PDF

71.5 KB Created: 2020-11-23 04:13:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4a81c61400c003376a918c111314912a SHA-1: b9ab4bd11fd7ce447268008f7da011dad441d5af SHA-256: 1494344b7a8e2adea4f86c13ecfee2b50366793982f384cf6c4a19293f8b174c
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 0.9995

Heuristics 5

  • 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.
  • 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/123?utm_term=the+raven+full+poem+pdf PDF link annotation
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/7007845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381735/normal_5f946a1f68eab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449178/normal_5fa35c38a423b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459174/normal_5fa9a9d943163.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/3dfb1937-0ffb-4f2e-bd56-e57601bf5554/8609597185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/311e7e50-317d-4ce7-9dd7-adc2040e1791/iki_ynl_anova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29604f66-ae64-40ae-8363-1f3759b7c0d1/android_oyun_clup_gta_3_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81d0c74b-dae2-414c-9fe6-7bbac3c06766/98966316336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38299b13-28de-4a00-a846-5282935612ea/54406707394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2029ff0-bc53-43b4-8a72-e7da68588d5e/poputu.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_off0000dbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF1 5112 bytes
SHA-256: 582f7c33922ec3d1c5219a6060dd9f1e9ceb66bd294c1b2b4741412086bd97c5
font_01_sfnt_off0000ed35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED35 10792 bytes
SHA-256: df7d61a8c988ebfd3c05433c7b1616df47410502c30100cae55e2562d31ec3c2