Malicious PDF — malware analysis report

Static analysis result for SHA-256 778085c717592520…

MALICIOUS

PDF

75.4 KB Created: 2021-05-11 18:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 18503be7240da52828151d30aedbcf45 SHA-1: b7b40838192b723843093c29b3342c516aac12f9 SHA-256: 778085c717592520d9cac8ecf0131b1352fd3857d264f6bb4b2c7ea6da941bb2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and one prominent URL is presented as a download link for printer drivers. The PDF structure and embedded links suggest a phishing or malware distribution attempt, likely leveraging social engineering to trick users into visiting malicious sites.

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://jacksth.ru/strik?utm_term=hp+laserjet+1100a+scanner+printer PDF link annotation
    • http://vidoxilaxugak.22web.org/report_on_kerala_floods_2018.pdfIn PDF document text
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/sojadimu_monupabuter_geluwax_xafamazo.pdfIn PDF document text
    • http://repizedozoful.sportsontheweb.net/vogote.pdfIn PDF document text
    • https://jotuxopa.weebly.com/uploads/1/3/4/2/134265841/vimuwoko-luduzubekuwopi-xavorelaj-ralojebofafe.pdfIn PDF document text
    • http://tazikuruwuwozu.22web.org/apache_rtr_180_images.pdfIn PDF document text
    • http://tikovg.xyz/muwajibabisekapugd4k80.pdfIn PDF document text
    • http://fakts.design/monopoly_rules_money_south_africapjugo.pdfIn PDF document text
    • http://legendbilisim.com/farewewulazatesifeted61q5.pdfIn PDF document text
    • http://kismykeitio.best/34177241579234ue.pdfIn PDF document text
    • http://mosasekoz.22web.org/56758321318.pdfIn PDF document text
    • http://polnews.xyz/angularjs_templateurl_directiveslg88.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lukovim.epizy.com/74065687415.pdfIn PDF document text
    • http://niselasot.atwebpages.com/59438863591.pdfIn PDF document text
    • http://mobukug.myartsonline.com/rabixumudixava.pdfIn PDF document text
    • http://nudikemiwi.rf.gd/26262586249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eeff5ac-571c-46b5-908c-1907d260ac67/kizebovupavodubidejemudos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1484bf42-0472-4566-8225-15f518e5ec23/what_are_the_codes_for_a_philips_universal_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77417feb-9486-4066-a322-897dedf6dbe8/libro_del_arte_de_la_seduccion.pdfIn PDF document text
    • http://kulebosux.myartsonline.com/hamilton_beach_18_quart_roaster_oven_ham_recipes.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_off0000e8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 5156 bytes
SHA-256: 1763b2093341c33175f278749acca3b54170171706e65631182a611fec6682ac
font_01_sfnt_off0000fa83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA83 11072 bytes
SHA-256: a0c3c5d8404262cbf54e1e796b8191d9512faf34248735413d428c86e10a636e

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