Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25c24b0e00b92b9…

MALICIOUS

PDF

76.9 KB Created: 2021-04-10 15:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e766ca268cffd79c818ebab576e558a5 SHA-1: f4e6d65fb9169077e7bad324e8653257d37cbb0c SHA-256: f25c24b0e00b92b905cf03bb61e75c0b8732932b41252e54abac5222eddb30d8
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious domains. The document body, though heavily obfuscated, contains references to 'Nalc 2020 rates' and 'wkhtmltopdf', suggesting a lure document. The presence of embedded URLs and the link farm nature strongly suggest the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

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 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://resalured.ru/strik?utm_term=nalc+2020+rates PDF link annotation
    • http://prodson.fun/descargar_peliculas_dvd_full_iso2us4q.pdfIn PDF document text
    • https://pilawero.weebly.com/uploads/1/3/4/0/134095891/6b4758078ae5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375541/normal_5feb40654b19b.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/hbjgQje/73152824375.pdfIn PDF document text
    • http://tulinejifuwo.22web.org/descriptive_essay_sample_about_an_event.pdfIn PDF document text
    • http://pifozuvarivin.22web.org/91579415051.pdfIn PDF document text
    • https://rifakinuzofu.weebly.com/uploads/1/3/0/8/130815009/darikekuninowefen.pdfIn PDF document text
    • https://cdn.sqhk.co/pibilebomek/jgXzOIu/simple_wedding_cake_decor_ideas.pdfIn PDF document text
    • http://musemumazizer.22web.org/october_blank_calendar_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477649/normal_5fe97a00b507c.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://xosudodobuj.iblogger.org/nurux.pdfIn PDF document text
    • https://navojinalano.weebly.com/uploads/1/3/4/7/134755450/720f767b1e3.pdfIn PDF document text
    • https://cdn.sqhk.co/dajuzafum/XNieXyy/63215132568.pdfIn PDF document text
    • http://women-ita.space/78001539443j2xa.pdfIn PDF document text
    • http://mimasajikataza.iblogger.org/ridemogodaluto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bunulewokiluko.epizy.com/romaxazuxonebured.pdfIn PDF document text
    • http://fezekugagow.rf.gd/88055091600.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_off0000f185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 5036 bytes
SHA-256: b0547bee53b4f9204749c86755248a8579dad57f93d55f1111c558b8f1703508
font_01_sfnt_off000102b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B1 10744 bytes
SHA-256: 0b06fdc7b8668bea61237fb526a2d3512c576a200fffeceea1c8449e32f8ae88

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