Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f719ac0be586bc5…

MALICIOUS

PDF

78.7 KB Created: 2021-03-05 15:43:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 1b40c13ca1c03488eacdfed479c65049 SHA-1: b0c65cff178a871b1358da5e7112cff07b4c8c92 SHA-256: 4f719ac0be586bc57abd0b5c2b472e7eb6996e27b8c30a24170531bd64b72703
126 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=jesse+shand+twitter PDF link annotation
    • https://penuwepilaxol.weebly.com/uploads/1/3/4/7/134756509/8018064.pdfIn PDF document text
    • http://vijuziruzunubiz.iblogger.org/new_fonts_for_photoshop.pdfIn PDF document text
    • http://difavusimope.iblogger.org/how_to_clean_hamilton_beach_iron.pdfIn PDF document text
    • https://luludosob.weebly.com/uploads/1/3/4/7/134703274/26d5b1.pdfIn PDF document text
    • https://losebevaxefot.weebly.com/uploads/1/3/5/3/135347065/df37e9.pdfIn PDF document text
    • https://wozomeki.weebly.com/uploads/1/3/0/7/130776066/f1469db2.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/sketchup_8_download_old_version.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/sun_tzu_larte_della_guerra_audiolibro.pdfIn PDF document text
    • https://jolibudowuw.weebly.com/uploads/1/3/4/5/134596284/nepepu.pdfIn PDF document text
    • http://xidasetetobuge.scienceontheweb.net/the_basic_practice_of_statistics_6th_edition_download.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/60768224628.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naxiwagozidixi.epizy.com/operations_manager_resume_examples_2018.pdfIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/what_are_the_5_operating_system.pdfIn PDF document text
    • http://zijiwaras.onlinewebshop.net/kesarijaforuxexafagabot.pdfIn PDF document text
    • http://foduwisidowej.rf.gd/game_designing_software_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/21415322880.pdfIn PDF document text
    • http://supajiwa.myartsonline.com/the_book_thief_audiobook_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/misikesig.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95C 4964 bytes
SHA-256: 3003007f13204b7147dc62a08d5ebd8470213641a03b37f04e43839b048107aa
font_01_sfnt_off0000fa3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3A 5020 bytes
SHA-256: 88a806961f5f4ed6e23a88431abf5bc2623e104a9f308307245c16d84234c55f
font_02_sfnt_off00010875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10875 10796 bytes
SHA-256: c6800a49bc97a6103144633fd3167a0861cf0903dff4f0ffaf49679ad3677b2c

Open this report in the interactive analyzer, or submit your own file for analysis.