Malicious PDF — malware analysis report

Static analysis result for SHA-256 da68b2508cbab3c3…

MALICIOUS

PDF

72.9 KB Created: 2021-03-19 13:30:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5be4170be6f78894e11de0c365d169ca SHA-1: 2864ff24c5734afa8c3f939ebeed9e52886c812a SHA-256: da68b2508cbab3c309266192fff9a2c5f5036e603e011b9ab13d95fecc44ff1f
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized PDF hosting sites, suggesting a link farm or phishing campaign. The presence of a redirector URL and the ML classifier's high confidence score indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://lozipotod.ru/strik?utm_term=economic+skills+lab+advantages+compared+answers PDF link annotation
    • https://xelegiri.weebly.com/uploads/1/3/4/4/134435730/bokiju.pdfIn PDF document text
    • https://cdn.sqhk.co/wenewojufaj/gLcBDuU/81524095358.pdfIn PDF document text
    • https://burufazifefep.weebly.com/uploads/1/3/4/5/134584298/7052869.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372681/normal_6008fc48c5f58.pdfIn PDF document text
    • https://cdn.sqhk.co/kibizatududo/pjbiM4f/siren_head_game_free_download_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418791/normal_6031c332ad166.pdfIn PDF document text
    • https://kaginugopaz.weebly.com/uploads/1/3/4/3/134310825/tedovameze.pdfIn PDF document text
    • https://didilajuti.weebly.com/uploads/1/3/4/5/134585724/4921277.pdfIn PDF document text
    • https://retizobokeli.weebly.com/uploads/1/3/1/0/131070240/perudatafipigixavi.pdfIn PDF document text
    • https://kigatuxusim.weebly.com/uploads/1/3/5/3/135305206/d7dfeef47.pdfIn PDF document text
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/jezitariz_seluwamoxepuwa_vizuriresuwizi.pdfIn PDF document text
    • https://pabimoju.weebly.com/uploads/1/3/3/9/133997489/lupijeji.pdfIn PDF document text
    • https://cdn.sqhk.co/lewivapawo/PFhihcN/metal_radio_station_number.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/eXetRcq/cats_vs_pigs_battle_arena.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/ziwuvijevo/78425142890.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/8472293560.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/sesasokabotibeni.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/4846819003.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/best_battery_powered_blower_consumer_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/gegit.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_off0000db33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB33 5704 bytes
SHA-256: 4a9351eb1a309e7a86f46327acef2f7cf54b75c0865d7b8d12921197b8d43c25
font_01_sfnt_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 11832 bytes
SHA-256: 345b24a3ee861ddd5daa77e80f89750bac8e766e1a6becd195bba387e952027b

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