Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7bfb70d58ddc45…

MALICIOUS

PDF

75.2 KB Created: 2021-03-02 17:00:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bd9a625e0712fd0956471090979d2186 SHA-1: 41591ce9322e162c5f8f4bfab2b905b2acc71c9a SHA-256: fb7bfb70d58ddc4599ba70ecdae794076500a36d0f1ff39bf5c380bff9dd6b91
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the 'link farm' heuristic further support this. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

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://crophysi.ru/strik?utm_term=notas+y+letras+de+canciones+cristianas+para+piano PDF link annotation
    • https://cdn.sqhk.co/gidenateg/o9hheHZ/simon_trees_nelsons_solicitors.pdfIn PDF document text
    • https://lirajibabu.weebly.com/uploads/1/3/4/6/134635624/72dca7c.pdfIn PDF document text
    • https://cdn.sqhk.co/dexizajifu/fC6jbUc/calendar_august_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486778/normal_5fd19c7f14263.pdfIn PDF document text
    • https://cdn.sqhk.co/kagumuzom/hjhjDe4/62469962928.pdfIn PDF document text
    • http://tudiweva.22web.org/honda_gcv160_auto_choke_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/rirakibugo/wtujjhj/lapeketubunu.pdfIn PDF document text
    • https://jajonugofetafis.weebly.com/uploads/1/3/0/7/130776034/7431952.pdfIn PDF document text
    • https://somirurawepaf.weebly.com/uploads/1/3/1/3/131381963/3176646.pdfIn PDF document text
    • https://xufetujada.weebly.com/uploads/1/3/4/7/134745175/8370764.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lepejifilafimif.rf.gd/bigger_leaner_stronger_workout_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/80512701544.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/desovopimufilusutuvawali.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/chomsky_normal_form_remove_epsilon.pdfIn PDF document text
    • http://nejovafejasujob.rf.gd/talespin_theme_song_mp4.pdfIn PDF document text
    • http://kasaxamaburabuz.epizy.com/vagekifewixoneso.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/convertible_debt_financing_term_sheet.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_off0000e5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E7 5140 bytes
SHA-256: fd4133ec4e399956221a22064865ebde98f069cdc2d6127b749cae5bc6c9c392
font_01_sfnt_off0000f77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 11656 bytes
SHA-256: b7aa3cb1e933b577ebb07820ee4d04dd5dfda31e44c8168a639a2237ef538418

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