Malicious PDF — malware analysis report

Static analysis result for SHA-256 15fc6981b17d8738…

MALICIOUS

PDF

69.8 KB Created: 2020-11-24 14:43:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3c5f95d020268d1e309c338869c76061 SHA-1: 9374e926db4804d3ec2592f46ac68a5fdb43cfd0 SHA-256: 15fc6981b17d8738da92512d3df20c7f06ab777b00fa85fcb51fd3f21765b2a7
164 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. It uses an urgency-based lure. 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=idaho+wolf+population+2017 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413109/normal_5fb9cc7cdf6b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366325/normal_5fa9bc8423e4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368471/normal_5f9cc276dbf9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368949/normal_5f947ccd9f3c2.pdfIn PDF document text
    • https://fifimijo.weebly.com/uploads/1/3/4/7/134748793/6560693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380545/normal_5f8e2ce518f1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452852/normal_5fa35b44adcae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378623/normal_5f93f45c3e744.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388619/normal_5f97d8dfceea7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417528/normal_5f9753713e53d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371812/normal_5fbce2ea1c079.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sasufufa/48699767173.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/nemevutolo.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/step_brothers_watch_online_full.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edcb553f-56a0-4009-aa70-66ffccabf34b/leketapan.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/example_of_letter_of_satisfaction.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_off0000d3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AA 5288 bytes
SHA-256: bcef1e338b4532c6bf51970fc47a1b598f5452e21f367703929850923ca523a9
font_01_sfnt_off0000e5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CD 10724 bytes
SHA-256: ec9ecba8a82c0c59ebf62bdd356a1754a336fe6168f37c230ffff5de714a8825