Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b17bc343be01de…

MALICIOUS

PDF

78.2 KB Created: 2021-04-01 00:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 6e45274053707e9dccc9990e6ca47472 SHA-1: a03d62dfa6500dad8ec3996e8069fc0be8145ad8 SHA-256: a8b17bc343be01de8238b020f6496aa257e045e6f4e21a0d943cff2c032f0f5b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://golowaki.ru/award?keyword=apprendre+le+fran%25C3%25A7ais+facile+pdf PDF link annotation
    • https://cdn.sqhk.co/xafukapewe/q3xghij/800_words_cast_and_crew.pdfIn PDF document text
    • https://lonexuganaj.weebly.com/uploads/1/3/1/8/131856054/tixuworinize_ganaxovisukew.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzosexiwugu/f3VWkgc/54920801541.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/gA78Kc1/hockey_wallpapers_high_resolution.pdfIn PDF document text
    • http://woxuvuxu.iblogger.org/dell_monitor_2405fpw_manual.pdfIn PDF document text
    • http://mubinazo.22web.org/disable_advertising_id_collection_android.pdfIn PDF document text
    • http://datovufes.scienceontheweb.net/24673507764.pdfIn PDF document text
    • https://cdn.sqhk.co/webepinovet/Sjijfge/flute_music_ringtones_mp3_free_download_malayalam.pdfIn PDF document text
    • https://cdn.sqhk.co/dimowitop/ZqhaifI/fajajet.pdfIn PDF document text
    • https://saguwaxofules.weebly.com/uploads/1/3/2/6/132681351/fisutefok.pdfIn PDF document text
    • http://xexewolos.iblogger.org/91767685364.pdfIn PDF document text
    • https://cdn.sqhk.co/ratufewebu/cXgfDGL/vujuwuliwumu.pdfIn PDF document text
    • https://cdn.sqhk.co/zizaratijiga/mjhQgg8/14781536923.pdfIn PDF document text
    • https://diwijavel.weebly.com/uploads/1/3/4/6/134691177/roturav-pusapotegisi.pdfIn PDF document text
    • https://www.francaisfacile.comCalendrierIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wugujub.onlinewebshop.net/distribucion_binomial_negativa_ejercicios_resueltos.pdfIn PDF document text
    • http://telosizaba.onlinewebshop.net/ensayo_crear_o_morir_andres_oppenheimer.pdfIn PDF document text
    • http://filanak.rf.gd/tisirevevalade.pdfIn PDF document text
    • http://mifumupesa.rf.gd/atahualpa_yupanqui_poemas.pdfIn PDF document text
    • http://bejuzijufure.rf.gd/duwamish_river_fishing_guide.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_off0000db9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9E 5320 bytes
SHA-256: 01db35eddfab79f8eafc4678801d47803ca44fe033621bbf8e672c3c16415527
font_01_sfnt_off0000ed84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 12008 bytes
SHA-256: bda54eb42992defb2e7ca1abf4a78851f8610196cf248410ee28406e98465084
font_02_sfnt_off00011436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11436 16168 bytes
SHA-256: 794d8cc090a449e0d460036171b2d5b2c749cb0dc3f17972c44626ada68ee3d8

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