Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a1ce672d7129f7…

MALICIOUS

PDF

90.6 KB Created: 2021-09-14 05:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1399cc31dae2932d1aeab9206b72d92e SHA-1: e72c50e36dc52a45e506af3def967202f76c8271 SHA-256: e1a1ce672d7129f71c3a9479fdcda5ae4b1b4555cbadfddaa8f0c306f92c662d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or malware distribution attempt. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for link farms, further supporting malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=optimizador+de+ram+para+android PDF link annotation
    • http://saothienemb.com/uploads/images/files/74780667695.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/50063530371.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/51068709151.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/pelupogodixuxela.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/xilexowejedawebesil.pdfIn PDF document text
    • http://deltools.com/userfiles/file/didovonipuxokirinopalowe.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/777p5gep9uh66sf0ocdbdef45m/vujosifafakidono.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/jorisifipiruzomixutatizim.pdfIn PDF document text
    • http://air-ned.com/uploads/files/17231589944.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/sagedakinisarenige.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/neluzobafapabararegine.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/kisadesalovudola.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-05/images/files/neridezamovetit.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ad9407906---12985385099.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/28568060258.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/97675955600.pdfIn PDF document text
    • https://media-get.com/userfiles/files/mujebebowip.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/97829206332.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/92665012649.pdfIn PDF document text
    • https://promise-land.com/upload/file/wusosawiperijatemono.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/tamedukilafur.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/mikag.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/tagisaripod.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/wozeseregixuzutut.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/20017437110.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://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_off0000f7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 10424 bytes
SHA-256: ddf2e53cb0cb046d9f0588a1c24ee2793ef189457ffb449217b0955745a1d710
font_01_sfnt_off00010f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12790 20500 bytes
SHA-256: 589e4024a1f18edca23233181cdfef2260c4e7e2b615fa792e86420c7441dbd3