Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e4a341c50f2996…

MALICIOUS

PDF

84.0 KB Created: 2021-01-10 17:33:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a84cecfad81948b27e020e3bb95c706f SHA-1: d49bcd99b8203f79142b59421a053b71619bdd49 SHA-256: 52e4a341c50f299642a6d56e4aed81e1bf0e88130d2ca55c7418fdd02383218d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO spamming attempt. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or scamming by directing users to potentially harmful websites. No scripts were extracted, but the presence of numerous external URIs suggests an attempt to redirect users.

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://trafftec.ru/aws?utm_term=top+blockchain+platforms+2019 PDF link annotation
    • https://xajupodesuze.weebly.com/uploads/1/3/1/3/131380723/saxepoxezomib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_5fb4efb83e6bc.pdfIn PDF document text
    • https://site-1083884.mozfiles.com/files/1083884/brasfoot_2020_crackeado_android_apk.pdfIn PDF document text
    • https://kovovovugatu.weebly.com/uploads/1/3/4/5/134599685/1066247.pdfIn PDF document text
    • https://kixujededewi.weebly.com/uploads/1/3/0/8/130814479/lonalinuzubunud.pdfIn PDF document text
    • https://site-1176333.mozfiles.com/files/1176333/critical_raidence_pokemon.pdfIn PDF document text
    • https://site-1168413.mozfiles.com/files/1168413/2020_formula_40_pc.pdfIn PDF document text
    • https://site-1166084.mozfiles.com/files/1166084/9596988549.pdfIn PDF document text
    • https://lenimupet.weebly.com/uploads/1/3/4/0/134013040/7164598.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444356/normal_5fee544ede2bf.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/bejikefowu/black_panther_hd_images_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/aesthetic_gif_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/87606121829.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/38144139345.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/bharathiar_university_bcom_ca_syllabus.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_off0000fdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 5560 bytes
SHA-256: e521ab1d96195fedf58d71852e0bce96ede069c5984f145c771c253e3bf036aa
font_01_sfnt_off00011066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11066 10612 bytes
SHA-256: 0c796a0b8794005d6bb1fd7dfe5c1e46003a9dbd1a8569da7965f1583052849f
font_02_sfnt_off000134a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A4 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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