Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43f0a25ea26e53b…

MALICIOUS

PDF

79.0 KB Created: 2021-03-10 20:56:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ca09cd4f1759f0e3c9e9af227bfdde01 SHA-1: 71418b694ad20bc558aaf201af2ea0e1160e1835 SHA-256: f43f0a25ea26e53b40c86727c06a59488a5b9acac24233accd15e00c51f1360a
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/award?keyword=marathi+books+pdf+free+download+websites PDF link annotation
    • http://kidepokapila.22web.org/easy_brochure_template_word.pdfIn PDF document text
    • http://jubigorut.iblogger.org/arabic_locale_date_format.pdfIn PDF document text
    • http://vugiris.22web.org/86633514399.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/gozikum.pdfIn PDF document text
    • http://zudetubakameg.iblogger.org/honda_fg110_tiller_service_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rabatelekovufar.myartsonline.com/the_book_thief_movie_age_rating_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcaed2eb-b509-492f-9241-b57e565594bc/12_step_guide_to_using_the_aa_big_book.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/26216479100.pdfIn PDF document text
    • http://jenurinufaka.rf.gd/fivb_e-_scoresheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbe439f7-cbeb-48f8-a504-bde76518b26f/netgear_wnce2001_firmware_aufspielen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cab579aa-2fac-415d-8f3e-d2287fda197d/ridukiviboguwisiwidelu.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/33054272683.pdfIn PDF document text
    • http://xatamiv.rf.gd/what_happened_to_darrell_sheets_son.pdfIn PDF document text
    • http://wizigipixe.atwebpages.com/kenmore_elite_he3_dryer_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67c0aebb-2fb1-47ee-b591-a70e59fc8505/powerback_5250_watt_generator_oil_type.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/gavigib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/734fdea9-6b4d-4c78-bb1b-fae3af166dbc/dujinugadakupa.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/blank_calendar_template_2019_august.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/jeopardy_game_template_for_education.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/fawiriselosufuzigide.pdfIn PDF document text
    • http://gafodix.myartsonline.com/gikip.pdfIn PDF document text
    • http://lamekukibudinos.epizy.com/loan_agreement_format_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/35008939028.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_off0000f86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86F 5428 bytes
SHA-256: 5dd710d45b7fc6e37ab6798851d686ef6c677f710be5100d8a03c2feca6d4d79
font_01_sfnt_off00010af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF9 10240 bytes
SHA-256: f7260d8fd14593da959e6d926c3c28cacfb28d4bd4e21463ebf8e79d9d8306e4

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