Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca6aa57927a9501…

MALICIOUS

PDF

69.1 KB Created: 2021-02-21 06:09:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 81f5c9d83a9282a759f879b3595d3416 SHA-1: 5f7a208443e2e8b6a9bbc0080e15914f2a0dee5c SHA-256: 6ca6aa57927a9501bcb195b37bd35d6331fc61ef07d5609b42bfeffe3998999e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://maypoin.ru/strik?utm_term=manifiesto+comunista+pdf+descarga+gratis PDF link annotation
    • http://steblin.pro/97263321204mpb7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387229/normal_6000a02122638.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500447/normal_5fec7fffc8fbc.pdfIn PDF document text
    • http://meetraisins.club/angry_birds_transformers_hack_gems3aln1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458625/normal_5ff4ed8fb1c08.pdfIn PDF document text
    • https://tizizuner.weebly.com/uploads/1/3/1/8/131872037/wulepekeniwogi_dupavax_faterujesi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416332/normal_5fc6dd77907f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391611/normal_6005a76fb3df8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379049/normal_5fcb42433ea36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491969/normal_6001bfac417d5.pdfIn PDF document text
    • https://sujuxeneme.weebly.com/uploads/1/3/1/3/131380470/b2ed76.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://veruzixiki.rf.gd/cica_care_silicone_gel_sheet_for_keloid.pdfIn PDF document text
    • http://pubexet.rf.gd/dyslipidemia_guideline__2018.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1B 5448 bytes
SHA-256: 773fb2fcc7686a9be7b888ee3293e7d01953bf90a72cfb130bb3d75b8642f356
font_01_sfnt_off0000cf8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8F 6148 bytes
SHA-256: 0b38f6fd5e0b54bfa22d5adee1cfe00629fe134100fc7cfc1ad14a2ab7974207
font_02_sfnt_off0000df6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6F 11536 bytes
SHA-256: aa6456cb445806193bbb531612d661ee499afb2969a95b979f9744bb1a51c02d

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