Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4f985a68b667c5…

MALICIOUS

PDF

89.3 KB Created: 2021-03-21 08:39:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 01d19234e07a09ed05a49accd58a9388 SHA-1: 87f4e1ffe5f3151ccf6e5e2497334fb1e2d69456 SHA-256: 6f4f985a68b667c5ffedb1b91467180c5a7d05cc9da4afb919b4a047057bb648
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as phishing-related by ClamAV. It contains numerous embedded URLs that point to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://bologen.ru/wix?keyword=nioh+enemies+defeated+damage+bonus PDF link annotation
    • http://getfreecreditreport.info/re_zero_light_novel_plotwhywm.pdfIn PDF document text
    • http://wafijazaxubot.iblogger.org/ccna_cyber_ops_dumps_free.pdfIn PDF document text
    • https://cdn.sqhk.co/junikesiza/MicsjjG/14851240945.pdfIn PDF document text
    • http://dayzcommunity.info/kiwezuteju4ely7.pdfIn PDF document text
    • http://baranaydin.org/can_a_wood_burning_stove_heat_the_whole_houseb7qx6.pdfIn PDF document text
    • https://cdn.sqhk.co/gikunixa/jaC8fgX/gizeliti.pdfIn PDF document text
    • http://electrumwallet.buzz/retrowave_font_makeruvisl.pdfIn PDF document text
    • http://jozipuvuwuzaj.mywebcommunity.org/79387015953.pdfIn PDF document text
    • http://lnstagramsupportinfo.com/jesuzofasevvm2h5.pdfIn PDF document text
    • http://rollernefrit.xyz/pekisetatanafadodubgcwr.pdfIn PDF document text
    • http://harmony-market.ru/how_to_change_network_on_samsung_s879155.pdfIn PDF document text
    • http://dasuwupozu.22web.org/84993708633.pdfIn PDF document text
    • https://cdn.sqhk.co/mewivupa/e4he07I/kawafosepulotoxasi.pdfIn PDF document text
    • https://cdn.sqhk.co/pegidago/7ja4Kii/kimuv.pdfIn PDF document text
    • http://helplnstagram-confirm.com/how_to_identify_drum_beatskjjd8.pdfIn PDF document text
    • https://cdn.sqhk.co/regisanozoxo/heLQ2yl/becoming_a_substitute_teacher_in_ny.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e92dbb21-8c3f-49ee-a874-cc7a65d78f90/wavagosaj.pdfIn PDF document text
    • http://rozopujonabesix.epizy.com/what_is_the_theme_for_the_poem_harlem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2d7e16a-aec3-415c-b869-98df2a4b26f2/62103065969.pdfIn PDF document text
    • http://kapirexazi.onlinewebshop.net/how_to_know_everything_is_ok_at_17_weeks_pregnant.pdfIn PDF document text
    • http://jiresigotapikeb.rf.gd/consumer_reports_work_from_home_jobs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c03c805-74fd-4496-b569-9e572f875d99/sennheiser_rs_170_troubleshooting.pdfIn PDF document text
    • http://zepizevut.atwebpages.com/39508057127.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A3 5304 bytes
SHA-256: 79a69e83435250171315f42f00fd2eaf320cb76fe4aec10680ae7088c8c48eb2
font_01_sfnt_off00011b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B90 11232 bytes
SHA-256: 414f8bf24af76bb26f1f37f3c7c256992e3f0b41f82094bbebb91cb3ebce19e5
font_02_sfnt_off0001421e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421E 16324 bytes
SHA-256: fcbeed813a05de654d2947c58aec7736ea9f829aed989b1f14629b154f088721

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