Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a8ee3ceff24e93…

MALICIOUS

PDF

66.8 KB Created: 2021-02-15 09:54:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1e2f486a348d0f5f7ebfa29ff684ab4b SHA-1: 9289b1e90cbde5f6b8af6efa1e4ca770fe77aa63 SHA-256: 08a8ee3ceff24e9355461ada4169c4dc9fcdb94d6b486f487c6a33793cc7693c
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-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://crophysi.ru/strik?utm_term=dixie+horn+for+motorcycle PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480387/normal_600d4ca790976.pdfIn PDF document text
    • https://cdn.sqhk.co/wanevakaxuma/ijX3Vjb/38607359024.pdfIn PDF document text
    • https://cdn.sqhk.co/jakadamalate/jdoFiHB/54484412936.pdfIn PDF document text
    • https://cdn.sqhk.co/medasozuf/cZjhjhd/absorption_spectrum_vs_emission_spectra.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408713/normal_601b1e9661113.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374181/normal_6026805002a87.pdfIn PDF document text
    • https://jeludumekidi.weebly.com/uploads/1/3/2/7/132740852/7715694.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/haDs6ge/dan_the_man_levitan_youtube.pdfIn PDF document text
    • http://duplicwcnj.space/63483440046rg8wx.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/xukirizugukugi/chitramala_naa_songs.pdfIn PDF document text
    • http://zopogapusokudip.rf.gd/83409256338.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/sidexowofumefo.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/20106901807.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/50223630912.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_off0000c87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87C 4904 bytes
SHA-256: 639538cc7a982787c12152fb41aee4bcfac68ced9a58bdd295459a617ddeb9f6
font_01_sfnt_off0000d916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD916 10972 bytes
SHA-256: fb26c5b0c3ec2d637a904e07e2b2a4cdd0af334dd517e953b505d9a3ceb306cf