Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab00598fa24a5fef…

MALICIOUS

PDF

72.2 KB Created: 2021-03-03 14:47:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7e5e745fece1b2a041bab21f4ef2a107 SHA-1: c7c504a0f16d76833b4ca0c7548009b5e95250fe SHA-256: ab00598fa24a5fef3ba6aeac9469e8fdaf5ced2a40f537788d7efab3f992992c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate that this document is designed to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=onan+service+manual PDF link annotation
    • http://ihsteam.ru/purowawevamidofukjjt.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/first_alert_carbon_monoxide_alarm_no_battery_replacement.pdfIn PDF document text
    • http://fotobaruti.22web.org/letaputotoketozevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388827/normal_6017b37517739.pdfIn PDF document text
    • http://weinmvc.net/ps2_game_god_of_war0rx2o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480728/normal_601bfad0a58a6.pdfIn PDF document text
    • http://larijasetejupaz.mypressonline.com/child_bible_stories_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451545/normal_603399f608d6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387718/normal_600539e57c12a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486221/normal_600322938822e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427293/normal_5fff5d3427ea5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lerekik.epizy.com/cant_ask_dont_need_wont_acknowledge.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/dupetos.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/dwayne_bravo_dj_bravo_song.pdfIn PDF document text
    • http://nenedabex.rf.gd/dirirebapifaxefoxub.pdfIn PDF document text
    • http://lapetagalelan.myartsonline.com/2005_cadillac_cts_for_sale_in_saskatchewan.pdfIn PDF document text
    • http://suzitemilivofer.epizy.com/how_to_set_lasko_space_heater.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/wimejinomaxivejul.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/77690878940.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_off0000df3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3F 5032 bytes
SHA-256: 2d02d331445934e38e53e88fafebd59084169fe455d0db0cc4d5c8baae23da72
font_01_sfnt_off0000f04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04C 10384 bytes
SHA-256: cc2dcc15e6d5565904295772ab62cf286bdcbc6cd001d37cc7554af5955693f2

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