Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b176b3db2cd62d3…

MALICIOUS

PDF

71.8 KB Created: 2021-02-24 03:27:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2377d961995ca7d1d1a67452ea25b9f8 SHA-1: 03b3a01dc2a872f4acaf057e6a344c21f295c18e SHA-256: 5b176b3db2cd62d36d6e4bd1ddc264cac618c33d0b919b856c278ccd50b2e8a4
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least two pointing to suspicious domains ('leonvi.ru' and 'peskomment.ru'), suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, consistent with a generated document designed to lure victims.

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://leonvi.ru/123?utm_term=mathematics+for+electricity+and+electronics PDF link annotation
    • http://peskomment.ru/671699841949z8zk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454277/normal_60061df10fc81.pdfIn PDF document text
    • http://voiprormul.xyz/bengali_movie_sultan_all_video_songeo1sd.pdfIn PDF document text
    • http://vefobekusira.iblogger.org/dukomogejesosote.pdfIn PDF document text
    • http://cabinetsly.xyz/arcore_by_google4ysp8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490264/normal_5fdc406353cd3.pdfIn PDF document text
    • http://zatodawu.iblogger.org/gusosavuvixiju.pdfIn PDF document text
    • http://true-board1.club/bad_times_streaming8maqa.pdfIn PDF document text
    • http://springtea.space/personajes_y_descripcion_de_cronica_de_una_muerte_anunciadaotkvp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486552/normal_5feb941fd990d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mojadifo.rf.gd/mandated_reporting_pa_training.pdfIn PDF document text
    • http://nunoxemimo.rf.gd/chemistry_lab_manual_for_class_10_cbse.pdfIn PDF document text
    • http://wabanatebaxu.epizy.com/how_to_improve_my_childs_learning_skills.pdfIn PDF document text
    • http://nogojituwizax.epizy.com/aliphatic_electrophilic_substitution_reaction_mechanism.pdfIn PDF document text
    • http://tosopipates.epizy.com/73155916186.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_off0000da92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA92 5368 bytes
SHA-256: 66064e2a610c398bb88207e4122bf4e1a83f137f573e2fdf73d5d1db3bd793e2
font_01_sfnt_off0000ecbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBF 11036 bytes
SHA-256: 56527735b40811c99f47207cee4b1da837508a30fd122ac82523d4857f92c5b5

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