Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e287ce31ba1f4f…

MALICIOUS

PDF

79.5 KB Created: 2020-11-14 02:29:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5657d339afad761474575f32759a9f07 SHA-1: 92799988227d2374556fc4933b4fd8c903bc033e SHA-256: a8e287ce31ba1f4ff6697ab0daee93f47e3554948cfbc539c0eab529beb411cb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains embedded URLs and is flagged by heuristics as a potential phishing or malware distribution vector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with one pointing to 'https://s3.amazonaws.com/toliwudalamem/21362520606.pdf'. The primary malicious URL identified is 'https://traffking.ru/strik?utm_term=pythagoras+theorem+lesson', suggesting a lure to a malicious site.

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://traffking.ru/strik?utm_term=pythagoras+theorem+lesson PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387421/normal_5f9b377197a05.pdfIn PDF document text
    • https://xokuriwuboteze.weebly.com/uploads/1/3/4/6/134663839/2ec7a9a19.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/toliwudalamem/21362520606.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/xaguwipimifixu.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/takagi_tankless_water_heater_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee65880b-028b-442c-b745-7288e7258f0a/84996293889.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f045c984-b77c-433c-a1d1-85d5abe1a91d/kuxasesugodadepoxisifug.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/lovirokadonesaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2906875-8710-4d27-84de-3e0e8091b185/mefetobexobufikukareva.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/kroger_pharmacy_jefferson_ga_hours.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/turn_undead_pathfinder_2e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dd112f0-b828-4aa1-9c86-8b0185dba14f/star_wars_poster_a_new_hope.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_off0000fbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE9 5204 bytes
SHA-256: ba7aaa7d2af27a379e51cb55fed147ac7602cd0669b0ae83a85b1741e615a7c8
font_01_sfnt_off00010d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7C 10468 bytes
SHA-256: e615cad8fc8d52a2f57edb348695c46c0965dd712a590cd7c9b9a4d46d5e374b

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