Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1ff5f5135eb8bc…

MALICIOUS

PDF

65.1 KB Created: 2021-01-12 15:31:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a9e51ad887298bbb4b2d4efa6d246cd8 SHA-1: 51bbd0ffc7723dcb80a9e3d0a73aaab6a806c04b SHA-256: 3c1ff5f5135eb8bc313dd1dbcf234a1fd2ef84ec340ba68830f9ef9e91fd7a04
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to cloud storage services, indicating a link farm or distribution mechanism. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing or trojan variant. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to manipulate search results or distribute further payloads.

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://traffnew.ru/aws?utm_term=bingo+card+generator+excel+template PDF link annotation
    • https://lejoxenususoja.weebly.com/uploads/1/3/4/4/134497781/3291524.pdfIn PDF document text
    • https://cdn.sqhk.co/kixarozikej/C3GigiW/nowatiwogogati.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/Bjjgjjh/15627633446.pdfIn PDF document text
    • https://fokakumunimu.weebly.com/uploads/1/3/4/2/134266115/jelufoperopat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390664/normal_5f958e07f2f5d.pdfIn PDF document text
    • https://nifevokore.weebly.com/uploads/1/3/1/4/131437532/4298116.pdfIn PDF document text
    • https://woveguzusozor.weebly.com/uploads/1/3/1/3/131383383/kazisami.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/woberiz/amgen_pipeline.pdfIn PDF document text
    • https://s3.amazonaws.com/remoxi/xokelelerevodevowuzojuxim.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/73304224996.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/enya_only_time_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/sanekufiwumafo/zerugakugonowew.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_off0000c1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F5 5332 bytes
SHA-256: 78a8103f2cff01616b7023d6a0af21d8c7c8493bf3e9cef6f679135493bf70ec
font_01_sfnt_off0000d408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD408 10452 bytes
SHA-256: 348766df678c1223159658e7ce415adb9347ff6421c05ff74ffc166813123ca7

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