Malicious PDF — malware analysis report

Static analysis result for SHA-256 c115ed65d1dd5c91…

MALICIOUS

PDF

79.4 KB Created: 2021-03-25 07:58:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5e4c5590b1ea5748e6380d877324cc99 SHA-1: 6e5572e2caea5f4997a7d83eaee3f4540df8af51 SHA-256: c115ed65d1dd5c917c6d9404e0f1458481fcb35f90e8e9c4c1ef3f16e902898c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a large number of outbound links designed to direct users to potentially malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to distribute malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/strik?utm_term=hp+laserjet+p1102w+blue+light+blinking PDF link annotation
    • http://xaxefewina.22web.org/sopodakatir.pdfIn PDF document text
    • https://debozapo.weebly.com/uploads/1/3/1/1/131164198/gezikuwumani_movepu.pdfIn PDF document text
    • http://bapomiju.iblogger.org/buccal_space_infection.pdfIn PDF document text
    • https://xuzizalebu.weebly.com/uploads/1/3/4/7/134772475/81f8c67669f7d5.pdfIn PDF document text
    • http://wivigunima.iblogger.org/jalokanefomidef.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/rdr2_side_quests_chapter_6ok63q.pdfIn PDF document text
    • https://rasisepuwefu.weebly.com/uploads/1/3/4/6/134678142/3728229.pdfIn PDF document text
    • https://wezisewego.weebly.com/uploads/1/3/5/3/135342704/7258822.pdfIn PDF document text
    • http://nuverlites.online/what_holiday_drinks_are_at_dunkin_donuts5rm9q.pdfIn PDF document text
    • http://world-wild-shop.com/goxekirukapinanizo58f2a.pdfIn PDF document text
    • http://subaxidubuju.22web.org/87900433230.pdfIn PDF document text
    • http://lnstagrambusiness.com/aruba_iap_103_configuration_guidelh538.pdfIn PDF document text
    • http://trysoda.pro/ar_15_front_sling_swivel2rmmn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rigozapovi.epizy.com/40498002939.pdfIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_506b9d6e9a5b4e52a421e74ead5c7a2e.pdf?index=trueIn PDF document text
    • http://nevefilin.rf.gd/apc_back-ups_xs_1300_not_charging.pdfIn PDF document text
    • http://solepaf.epizy.com/roadmaster_granite_peak_womens_mountain_bike_weight.pdfIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_1217cc99a8324606808ee4b443796343.pdf?index=trueIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_0e966ca36d154f3781a9e6d2408842b6.pdf?index=trueIn PDF document text
    • https://db6a684c-bd73-4a61-997a-17040cc1d896.filesusr.com/ugd/bbbb20_84f10ec0555547b4897145a34b085f60.pdf?index=trueIn PDF document text
    • http://joposib.rf.gd/xobijojokegoverale.pdfIn PDF document text
    • http://buwolewunajoj.rf.gd/87624989208.pdfIn PDF document text
    • http://pavebutom.epizy.com/chaalbaaz_movie_720p_2018.pdfIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_a46d8f7969074de081cc2aafd0fb7196.pdf?index=trueIn 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_off0000f711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF711 5740 bytes
SHA-256: f3dd950e5e4752c536a30290f95f293b98f9bf367fffa7e8400c17193ff06dbc
font_01_sfnt_off00010aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA5 10960 bytes
SHA-256: 567779ee41a7097caf463eba1acc4695fadf5cec0e8a784aedf0215f2a0dd91c