Malicious PDF — malware analysis report

Static analysis result for SHA-256 519f61cb34fd1011…

MALICIOUS

PDF

82.0 KB Created: 2021-01-23 00:10:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 755c44efb44d3dbbec54ccf060d21111 SHA-1: c7abc1c6fb0cf82c61b7b67b2f7f5e25adf720bb SHA-256: 519f61cb34fd10112df484f2b6c5edcc6fdf00093e57d66f77a1207d9feba34f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, with several pointing to disposable domains and acting as a link farm, a common tactic for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs indicates an attempt to redirect the user to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/123?utm_term=niveles+de+lectura+comprensiva PDF link annotation
    • http://lerevujoda.iblogger.org/ranemaralufuj.pdfIn PDF document text
    • https://site-1176864.mozfiles.com/files/1176864/tusisubotobegojitoduk.pdfIn PDF document text
    • http://tatajosak.22web.org/90642663937.pdfIn PDF document text
    • https://lemorixumo.weebly.com/uploads/1/3/4/7/134748879/93ce0ff1.pdfIn PDF document text
    • https://losanuritajog.weebly.com/uploads/1/3/4/7/134730792/939eb7a06d2.pdfIn PDF document text
    • https://nizifaweneli.weebly.com/uploads/1/3/4/5/134589853/xekanodoxixe-fowaxa-gazubuko-pubataxa.pdfIn PDF document text
    • https://cdn.sqhk.co/lopumilekana/2MsOmLJ/hotwire_last_minute_hotel_car_rental.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391015/normal_5fcc2a8a9ce07.pdfIn PDF document text
    • https://nipobajomofak.weebly.com/uploads/1/3/4/6/134641158/4898d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fikexole.rf.gd/free_rent_lease_agreement_form.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/rafiwawebe.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/pubg_mobile_esp_aimbot_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/1405013663.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/transformers_autobot_emblem_car_magnet.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_off000102de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 5248 bytes
SHA-256: c11435854abda09348f9206f76672306b4e4628f491f97a4440d98d58c5a8806
font_01_sfnt_off000114ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AB 11316 bytes
SHA-256: 9b8f76f11ac325a446b0b4b8c822f6fa997ee4819fd2198f423bec1ce9e68843

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