Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d8cb2d974cbc62…

MALICIOUS

PDF

70.3 KB Created: 2020-11-17 05:31:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a1d736f55d51239bf7e053b32c64e96e SHA-1: 15e47faa88be55bc780dc4642f4072737a380d8e SHA-256: d7d8cb2d974cbc62a71304b5e0e91199acfe101dbf462620c52e6decf0d24132
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-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://traffking.ru/strik?utm_term=download+full+size+instagram+photo PDF link annotation
    • https://guserokofetaw.weebly.com/uploads/1/3/4/3/134341966/806876bb.pdfIn PDF document text
    • https://sakuvida.weebly.com/uploads/1/3/0/7/130775714/8693383.pdfIn PDF document text
    • https://garigewofunem.weebly.com/uploads/1/3/4/3/134314314/8c920359ea5ca9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sinadi/a_writers_reference.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59b7041a-a251-4063-b574-752d117046e9/jafan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca08e200-3cda-4858-9636-a6737000f215/boost_mobile_wifi_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f6b0daf-4278-4040-b9ee-48e3b40112c8/59522783166.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/50235993332.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/21005599426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc8feeb7-3d34-4ca7-8de8-6a91ed8c0c4f/fuxenapekuzedarupebemiwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfae7d8a-b68a-42bf-8b7a-27b7bbdf1785/97323433002.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/how_to_clean_keurig_mini_with_descaling_solution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68651aa2-3ec3-4a35-a526-3b150797494f/85488747823.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DC 5476 bytes
SHA-256: 34a6492814c8b347e7adac550b26fbab40afa271c3dfaa7c3a5280350476721c
font_01_sfnt_off0000da73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 10528 bytes
SHA-256: 7cf456664ed7e244f83af894fa4d10bc182e168601fc44b732d8c22366a659a1
font_02_sfnt_off0000fe74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE74 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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