Malicious PDF — malware analysis report

Static analysis result for SHA-256 8742526b1dfefb48…

MALICIOUS

PDF

66.2 KB Created: 2020-12-23 23:46:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: da0bd8385cdebf3a1fbe5499f4901b3f SHA-1: 0d551b985a42121bff336291edcac29d1193ecb6 SHA-256: 8742526b1dfefb483fde7b44cca5349fe556ddab27cb3c1e7b8023167f885220
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://traffine.ru/strik?utm_term=sago+mini+world+apk+full PDF link annotation
    • https://lanoxujuzon.weebly.com/uploads/1/3/4/6/134630121/rasinu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403816/normal_5fb2a360838a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496380/normal_5fd7d578a81c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465938/normal_5fde9d930c378.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417426/normal_5fcda16e473a9.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/b2343202-df28-4e59-8ebc-f426bebc7355/wivezizosasuwidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/427cca73-66a1-4dc5-96fd-971e0cb0b72d/jessem_router_table_fence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59df837b-e2f2-4832-964d-d6b50d79c6b3/80413399073.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/8791604277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91e153d1-f1ee-408d-bf57-dc7fa3ace5ac/silef.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/zitegikudomu.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/85319375980.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_off0000c49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49C 5444 bytes
SHA-256: 6237746e4f82c089633b9943a8fd060b741256fabe5af4b052c348ab702dfd0a
font_01_sfnt_off0000d71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71D 10872 bytes
SHA-256: 93f59903c92c25acaab8d2b8b551e3e6a335d83c987c2e4c3c10219467810eb3