Malicious PDF — malware analysis report

Static analysis result for SHA-256 185d691fae26633d…

MALICIOUS

PDF

72.7 KB Created: 2020-11-28 13:22:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d75ce69494fc18130f0a07c46e09d67e SHA-1: 2bc46c9679c4b155d2651877dcc299a807dd1163 SHA-256: 185d691fae26633db9b839b53cb5075ab3a9558f725bd52fcb9fc33fe9d7541a
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-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://traffset.ru/strik?utm_term=an+introduction+to+conservation+biology+free+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464852/normal_5faf3ae640618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473651/normal_5fb29f59144c9.pdfIn PDF document text
    • https://gokipeko.weebly.com/uploads/1/3/4/3/134351508/b316b9f8e0179ac.pdfIn PDF document text
    • https://zusadubojurumez.weebly.com/uploads/1/3/4/7/134703186/f6f141bbc7.pdfIn PDF document text
    • https://lemurowivavaxub.weebly.com/uploads/1/3/4/4/134404776/1760112.pdfIn PDF document text
    • https://navubenawegef.weebly.com/uploads/1/3/4/3/134320789/desodikof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/899e1991-9324-4e9e-8ef6-aad9f12733e1/pomenasumowutilozavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/850f7f25-f1d3-468c-8334-4bfd4afab8af/harry_potter_torrent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4486e914-f1f6-4a55-9622-111a0946cb48/28543868706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62d91915-cd68-49d0-ad3a-dcdb92355820/jebofevuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81370ee5-a8bc-4ff9-b5f1-589da0347dce/super_size_me_esl_worksheet.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92F 5616 bytes
SHA-256: d80c4cc0cdd7e35f8502c568b1d1a61dc3a082c6bf4414f761d0a8a6c59776e6
font_01_sfnt_off0000dc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 10676 bytes
SHA-256: 2f9551fce470a20d9a2a77a8e632a8054ffd5647c1283297cb471d0e7716a9d6
font_02_sfnt_off00010031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10031 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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