Malicious PDF — malware analysis report

Static analysis result for SHA-256 1581fce6711d9bc1…

MALICIOUS

PDF

67.7 KB Created: 2020-11-10 15:06:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 60abd67d9c8c30eeeacdec18a0ea2d53 SHA-1: d3794a3b8bd4bd15ab6c23cdeee05b9dc413a179 SHA-256: 1581fce6711d9bc11ac4817116a1c175580bcf443cb82beef347b5c62cff218a
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 0.9998

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://trafficel.ru/wb?keyword=secrets%20of%20the%20baby%20whisperer%20pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f876b2c2ff63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367271/normal_5f91592139f61.pdfIn PDF document text
    • https://folukufisika.weebly.com/uploads/1/3/1/3/131384255/2449080.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/bojamipovupemar_fufilakawulubu.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/voniduzakozeluxagu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383807/normal_5f8d5f1191540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_5f891e219bb8f.pdfIn PDF document text
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/7403683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381085/normal_5f9af9339b219.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/bopuxosavubare/jinafepovaluwelatezapu.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/kebimefipuwe.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/bededon.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/50210698266.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/74022550814.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/the_57_bus_book_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/english_renaissance_artist.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_off0000ca2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2D 5648 bytes
SHA-256: de6cdb49b47f09da255da940dcd554e06ea9a9493f2a6ca8cacb7ffae7229bfd
font_01_sfnt_off0000dd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD78 10636 bytes
SHA-256: f51ba71e7ec8ec4aa6640390a27ea30379ee92759d3a1ffcb50803b82c664f96

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