Malicious PDF — malware analysis report

Static analysis result for SHA-256 48bbd4e85fadec70…

MALICIOUS

PDF

86.7 KB Created: 2021-02-28 09:08:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5db5061d9a2bd15319b96dbfa12cc5bb SHA-1: bffa655d1233249f599c822bd891abf2d78bbc81 SHA-256: 48bbd4e85fadec70224e7f9b8e538f149fe70edde18a8a2d9b3e198cfd823221
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a PDF link farm, which is a common tactic for distributing malware or conducting phishing operations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded URLs. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/aws?utm_term=explain+the+word+rainy+season
    • http://vanlit.ru/apache_hadoop_tutorialww986.pdf
    • https://cdn.sqhk.co/xufaribo/Jpgc5if/1080p_yoga_wallpaper_hd_phone.pdf
    • https://cdn.sqhk.co/tokotuxajif/xhfhjtb/battle_simulator_free_pc.pdf
    • https://sipadaguw.weebly.com/uploads/1/3/4/3/134322090/8867008.pdf
    • https://fevuvewuvadudu.weebly.com/uploads/1/3/4/6/134650824/dudalopotisabu.pdf
    • https://kazoxinajajidu.weebly.com/uploads/1/3/2/8/132815758/fofuguguzizapan.pdf
    • https://bilemupu.weebly.com/uploads/1/3/4/6/134654663/xiwoda-femipug-gasumonato-lurogimewa.pdf
    • http://quickpapp.online/georgia_guidestones_contains_depopulation_messageifjj3.pdf
    • http://momentshop.space/what_is_meant_by_international_tradednwvf.pdf
    • http://xviiivbgz.com/what_to_put_in_a_dm_screenhxv5j.pdf
    • https://static.s123-cdn-static.com/uploads/4388422/normal_5fccb685d8813.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/litunux/bridgemaster_e_installation_manual.pdf
    • https://s3.amazonaws.com/vapelurowar/bssc_graduate_level_notification.pdf
    • https://s3.amazonaws.com/lomuper/how_to_connect_universal_remote_to_tcl_roku_tv.pdf
    • https://s3.amazonaws.com/bitajemisajoz/athletico_mince_podcast.pdf
    • https://s3.amazonaws.com/rebesudanolo/lefegidis.pdf
    • https://s3.amazonaws.com/fasudikek/zokavaribinumozuf.pdf
    • https://s3.amazonaws.com/jobavo/13599250700.pdf
    • https://s3.amazonaws.com/jipowumat/83350293329.pdf
    • https://s3.amazonaws.com/susonanezaj/bloomberg_terminal_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010862.bin
b2be77d935e2054818f7d5fb656ef23ee10b194d81d53524e208ef9606cd2752		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10862 5056 bytes
font_01_sfnt_off0001199a.bin
29690d60650e353040c9345dee3bc405f28e690d94e8f2accf37de065ee603e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1199A 11016 bytes
font_02_sfnt_off00013f20.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F20 4324 bytes

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