Malicious PDF — malware analysis report

Static analysis result for SHA-256 734d065c59682ce6…

MALICIOUS

PDF

88.2 KB Created: 2021-02-27 11:58:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4d34e27a6db48f7077643823f8ff078c SHA-1: f55d07b6f7ed3b22f59c370dccdfa5a9f3447049 SHA-256: 734d065c59682ce68b3bfcc571f6a9b63dd7b09656fe7a49045f0ac1cf4f903b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or leading users to phishing sites. The embedded URLs and the PDF structure are consistent with a campaign to drive traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gimoguvi.ru/aws?utm_term=which+marvel+movies+to+watch+before+endgame+reddit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410962/normal_60036f2116a05.pdfIn PDF document text
    • https://dakopubelodeb.weebly.com/uploads/1/3/0/7/130775015/7b6df2eaf9e46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387813/normal_60356fa96b4cc.pdfIn PDF document text
    • https://dugizixenopiloj.weebly.com/uploads/1/3/4/4/134457585/xokalifolodomegomus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386834/normal_600ea866e9edb.pdfIn PDF document text
    • https://bopizuvobaz.weebly.com/uploads/1/3/4/6/134668398/zivegogarujowa.pdfIn PDF document text
    • https://banukusisazej.weebly.com/uploads/1/3/4/8/134893357/488387.pdfIn PDF document text
    • https://xupumoga.weebly.com/uploads/1/3/1/1/131164417/lekobakuja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493578/normal_602fe9e9af84d.pdfIn PDF document text
    • https://cdn.sqhk.co/sujutowupolu/noheWhc/giant_mens_mountain_bike_size_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/sadebupunen/iokDr0r/lozom.pdfIn PDF document text
    • http://tawojuxonivix.22web.org/chocolate_film_malayalam_songs_free.pdfIn PDF document text
    • https://ralirepiputup.weebly.com/uploads/1/3/4/8/134852471/f2af352cdc474f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445119/normal_5fe05f1f029a0.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/sajezife/28078724973.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/atualizar_whatsapp_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/pewirufomesakexilelafonu.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_off00011ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA6 5740 bytes
SHA-256: db7dd2eb904a90152fcb21e3ddaa9fbbf593f7c3c34aa098ccd8f6fa68062bca
font_01_sfnt_off00013019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13019 10276 bytes
SHA-256: f75d017fc00956b6f0a635ea80fe63bdc70a75f6eedfab2760df9c828299207f

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