Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcd940a940fa91a…

MALICIOUS

PDF

74.8 KB Created: 2021-02-28 13:58:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 12f2dcb5c3984fbd4624129fd49fa467 SHA-1: 15dcb195a17a9e9bc29f163f15ffc4f4b3cc2ab6 SHA-256: 5bcd940a940fa91acaed7342c2936e5b229daa565104ae8b85318e11b3176cea
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 0.9999

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://mezovuduw.ru/strik?utm_term=someone+like+you+piano+music+sheet+pdf PDF link annotation
    • http://itclick.pro/genero_dramatico6tmc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376598/normal_601f81ce8452b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406787/normal_5ffcb2ad95958.pdfIn PDF document text
    • https://laropavo.weebly.com/uploads/1/3/4/5/134585926/balogugenop.pdfIn PDF document text
    • http://makamar.tech/piligonexonemerewat9qx7l.pdfIn PDF document text
    • https://lavabowigu.weebly.com/uploads/1/3/2/6/132682694/be59bb01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495246/normal_6026e07097cf1.pdfIn PDF document text
    • http://pedagodogiko.getenjoyment.net/cuanto_dinero_se_puede_llevar_en_efectivo_a_usa.pdfIn PDF document text
    • https://tejukazirinari.weebly.com/uploads/1/3/1/3/131398521/136995.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/1063903669.pdfIn PDF document text
    • https://wiruwopifezub.weebly.com/uploads/1/3/4/3/134345133/9761723.pdfIn PDF document text
    • http://o-karte-kopilka.com/como_crear_archivos_en_iphone4wy59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385415/normal_6007e94a57b18.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/lekelepowo/biology_trivia_questions_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/32682832446.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/672064556.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/56808710591.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/bezidilivumi.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_off0000e72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72A 5568 bytes
SHA-256: d45aec3595472e2a549035b3b5d75ebc0df26c2c9ef9ee384baa127ecbf912ba
font_01_sfnt_off0000fa02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA02 10696 bytes
SHA-256: d643030c60e97e418d393e2d5348d8a944f92ce52099455c96b846db29b6da17

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