Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33323a1b6f8ded6…

MALICIOUS

PDF

87.1 KB Created: 2021-02-03 08:12:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 122a4d1091595ede3e164d93d13fc0dc SHA-1: e1d3e2d75280b7424e28e221573fdb071b252d7f SHA-256: c33323a1b6f8ded681362d175a709d61fd2d5341791ffb1b69030a64a3ead65b
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least two pointing to suspicious domains that appear to be part of a link farm designed to redirect users. The presence of these URLs and the overall detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/123?utm_term=deus+creator+omnium+spartito PDF link annotation
    • http://wexoxunesixu.iblogger.org/sevevapi.pdfIn PDF document text
    • http://leadtop.co/8587673269aacd1.pdfIn PDF document text
    • https://fikosaxan.weebly.com/uploads/1/3/4/7/134753192/4849741.pdfIn PDF document text
    • https://cdn.sqhk.co/lawotivu/zaVCjh3/92192111318.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zujexig.epizy.com/golot.pdfIn PDF document text
    • http://xibobok.rf.gd/lesson_plan_template_microsoft_word.pdfIn PDF document text
    • http://vajexakatozezal.epizy.com/najigolijogejaxopetajogix.pdfIn PDF document text
    • http://fusikisedote.epizy.com/pegim.pdfIn PDF document text
    • http://sexikiti.epizy.com/wikotowovup.pdfIn PDF document text
    • http://vodugesivizere.epizy.com/ceramah_bikin_nangis_tentang_ibu.pdfIn PDF document text
    • http://zaxutakizet.epizy.com/fufakaxawote.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE29 11060 bytes
SHA-256: 86193c5ce835687782a42956c3f6d68f40aa90c513410db8306dbd6e4b61718f
font_01_sfnt_off00010236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10236 5048 bytes
SHA-256: 4e284c337315b7eb72cf2e446c1afe5f350f89faf972c10969402fdfd7b090ac
font_02_sfnt_off00011351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11351 11828 bytes
SHA-256: be107e3859f2358dc3d6001fde9eb5ef28e1df8343eb3da656c5ac54d4a402d3
font_03_sfnt_off00013a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A03 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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