Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a78f3288f1bdad…

MALICIOUS

PDF

82.4 KB Created: 2021-02-28 02:35:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0787f92c2c1ae912c931533d9af3f81d SHA-1: 566a844eda82bd47f245940c89a6f8fc1688c701 SHA-256: 33a78f3288f1bdadd70472a4a58f782bd86b3d44f29ed570ee4a4d7f4919cb91
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'cianuro de potasio' (potassium cyanide), suggesting a lure to entice users to click on malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/strik?utm_term=para+que+es+cianuro+de+potasio PDF link annotation
    • http://good-production11.site/dapezemesiganutusufibane7908f.pdfIn PDF document text
    • https://cdn.sqhk.co/legusovej/iiiHIkE/carpet_cleaner_rental_publix_near_me.pdfIn PDF document text
    • http://lnstagram-office.com/we_got_married_season_4vyowc.pdfIn PDF document text
    • http://smeshnoykir.space/58239185558zf241.pdfIn PDF document text
    • https://cdn.sqhk.co/kezavilageg/hjajjgd/gogunizadupogugelax.pdfIn PDF document text
    • http://podarokinsta.site/koxigerapisorivubat84aj.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovusig/iaidCgd/88600678918.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480598/normal_6004ea028f325.pdfIn PDF document text
    • http://monanuzusud.22web.org/vijojoxewopuxu.pdfIn PDF document text
    • http://romeita.space/327806471992lu81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412568/normal_5fefceafc3af5.pdfIn PDF document text
    • https://cdn.sqhk.co/wasuxuletiz/hhjchaH/45386870030.pdfIn PDF document text
    • http://talakam.space/dead_cells_mod_apkzc6yp.pdfIn PDF document text
    • http://rrrrkkkkk.space/modern_principles_microeconomics_2nd_editionllvzc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://variwud.rf.gd/hand_power_tools_assessment_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/carbonized_rice_husk.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/thank_you_for_your_answer_in_german.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/16263068976.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/97374766434.pdfIn PDF document text
    • http://nupozefujelo.epizy.com/92939178127.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_off0000fc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5F 5160 bytes
SHA-256: 06ca7a83ed97b422f2f2de7c1ea0779e1fa934c1aaf3d130bafd82c0fab2bb08
font_01_sfnt_off00010dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFD 14248 bytes
SHA-256: 1303443d618f2435ab2dad3a0889e5276dad7c23adafbe8eee8f0c0a28e9f3c9

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