Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44377fdde359bbb…

MALICIOUS

PDF

76.2 KB Created: 2021-02-10 14:55:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 08952c4bb42461aa0aa07a082bba2986 SHA-1: 47fbd11d2b81ceb2014e07f95ee2bef7da533837 SHA-256: e44377fdde359bbb44684c49a880a0eab87ea9e4f8e95c84b7bbf2ab5a6460c3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various PDF files hosted on disposable domains and subdomains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://druttle.ru/123?utm_term=open+systems+theory+of+organizations PDF link annotation
    • https://cdn.sqhk.co/kopilixa/jifQijd/vifufukogepubuneg.pdfIn PDF document text
    • https://mutokanapagoz.weebly.com/uploads/1/3/1/6/131606569/zawumuzidalikod_limukififepotot_femamugavod_firatabifujizof.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/j4iayhe/likee_wallpaper_hd_download.pdfIn PDF document text
    • https://cdn.sqhk.co/someteku/hhmjjeu/battlelore_command_locust_expansion.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/icsR9ig/loboreretukuj.pdfIn PDF document text
    • http://bionatur.space/rexobawisapa9lt.pdfIn PDF document text
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/zekovatoxixetuje.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/Y1z9jbO/mimpi_ular_hitam_banyak.pdfIn PDF document text
    • https://cdn.sqhk.co/posebozej/zihjahg/myth_defense_2_df.pdfIn PDF document text
    • http://espaceabonnes.com/voice_assistant_samsung_s9_uitschakelenhbuzc.pdfIn PDF document text
    • http://flowerport.store/4551432974140psy.pdfIn PDF document text
    • https://murafasonuralab.weebly.com/uploads/1/3/5/3/135398902/7aa5b329a2ffe0.pdfIn PDF document text
    • http://tokigarodam.22web.org/63814532562.pdfIn PDF document text
    • https://cdn.sqhk.co/dunafafaxen/fOHcztR/88493808799.pdfIn PDF document text
    • https://dupukixulin.weebly.com/uploads/1/3/2/6/132681516/ketuki-juxutunitifu.pdfIn PDF document text
    • https://zolegezuboz.weebly.com/uploads/1/3/4/4/134462972/38ec01a5.pdfIn PDF document text
    • https://nelubetif.weebly.com/uploads/1/3/5/3/135322580/c791bb9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000eda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA3 5464 bytes
SHA-256: da32cac4c44e98f1a9325b9f6e890b64916374fc437c362408ff9a086c2d255e
font_01_sfnt_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 10644 bytes
SHA-256: 47003a8e184d93fd3c2b2c1c4046d34451f35f2c5d543d06c69c88f4e61a9908

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