Malicious PDF — malware analysis report

Static analysis result for SHA-256 a904db1a2766ca43…

MALICIOUS

PDF

127.3 KB Created: 2021-03-20 19:37:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f519f24297d5f7e00b9bc7e3c869254d SHA-1: 9b265e1c04ddaeb918c2f756763c6817e9ffd4f5 SHA-256: a904db1a2766ca43418e6449518f63874e737b2d56b29e369f482b8426b15326
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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://vilenefex.ru/strik?utm_term=les+miserables+2012+cast+innkeeper PDF link annotation
    • https://dedeluruxizo.weebly.com/uploads/1/3/4/3/134305162/1613223.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/hthbUgc/street_racing_crash_car.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/doziramodo-fosewifadodaviw.pdfIn PDF document text
    • https://kabudinikibe.weebly.com/uploads/1/3/4/7/134716255/lasanowemuzu-jitobi-jovipubame-janafate.pdfIn PDF document text
    • https://voguxobone.weebly.com/uploads/1/3/1/3/131379379/sirajef_kemejojow_rufonevuguji.pdfIn PDF document text
    • https://cdn.sqhk.co/dutimapo/hhj3eLd/23276672204.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_6367050eff8a4156af5a5f6320ce6025.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/bsa_environmental_science_merit_badge_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/napalojijajudikipa.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/domajilodenilulikodituvi.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/sukozukodofulidubar.pdfIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/52898237299.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/51522910750.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/job_performance_appraisal_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/44819892541.pdfIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_b6fb2778a75d4098a57ca1d4900e983c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tevomenil/77752032609.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/non_cursive_handwriting_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/lidulu.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/chromeleon_6._8_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/nimazovajogedanimagexav.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/beasts_of_no_nation_2015_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/how_to_teach_students_with_auditory_processing_disorders.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B190 5552 bytes
SHA-256: 51e10ad32baa80e148de06fdaa71e1e30a62d5ce5012fc2d62eaaee68bf40a57
font_01_sfnt_off0001c45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C45D 12224 bytes
SHA-256: cbabfa427618e3f21e2cde3c2296dd83b337d34844dcb7679567fd49f2ff4ef4

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