Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92e6d9d89d4651d…

MALICIOUS

PDF

78.0 KB Created: 2021-05-11 03:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 055d06fe698f1c014d09f2eabf9662ec SHA-1: 5a73ea925094083cf054526e6d6ba6ad034cca04 SHA-256: b92e6d9d89d4651db3836e504211b9b4c1b4c9e04c79723b9b6d81aafa7e2dda
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9995

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://xajibur.ru/strik?utm_term=is+greek+yogurt+keto+approved PDF link annotation
    • http://veviwumifuvemuz.mypressonline.com/what_is_another_word_for_all_the_best.pdfIn PDF document text
    • http://hrushch.space/pubamelefakifevagumonnj0f5.pdfIn PDF document text
    • http://muvajopumo.22web.org/what_not_to_eat_on_a_dairy_free_diet.pdfIn PDF document text
    • http://stickerrus.ru/ygs_biyoloji_soru_bankasdvymr.pdfIn PDF document text
    • http://demazopozegefo.22web.org/barron_s_new_sat_vk.pdfIn PDF document text
    • http://laulu-go.ru/air_control_valvein9s6.pdfIn PDF document text
    • http://fruittea.space/bowflex_pr3000_user_manualc61wp.pdfIn PDF document text
    • http://hookup671.site/josamitenegumujofer1q46.pdfIn PDF document text
    • http://yildirimotobursa.com/dutenumy2d8.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/los_principios_de_la_economia_ejemplos.pdfIn PDF document text
    • http://sekizabugurewud.iblogger.org/nisamujojob.pdfIn PDF document text
    • http://merulabodonulu.iblogger.org/ccna_200_125_labs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ludoxijijux.rf.gd/luwalaxulije.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/que_son_los_dispositivos_de_procesamiento_en_informatica.pdfIn PDF document text
    • http://vizulubafaxal.epizy.com/80259751296.pdfIn PDF document text
    • http://viniwowosur.onlinewebshop.net/89072996001.pdfIn PDF document text
    • http://pubopebiwofaz.epizy.com/37789705202.pdfIn PDF document text
    • http://nirobow.epizy.com/reduce_illustrator.pdfIn PDF document text
    • http://sivikonalijuto.myartsonline.com/addicted_novel_book_1.pdfIn PDF document text
    • http://nulitapa.rf.gd/artificial_intelligence_a_modern_approach_answers.pdfIn PDF document text
    • http://pokogasojogev.epizy.com/cinema_paradiso_theme_piano_sheet_music.pdfIn PDF document text
    • http://zunufofidufup.rf.gd/33977456854.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_off0000f1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 5256 bytes
SHA-256: b96caf07e9859aeefc49790ba9faadac59a5ddfb2fd6c38034220db354034c64
font_01_sfnt_off000103d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D2 11228 bytes
SHA-256: 1c8568a0b35d1d51220f3bce37c821ec93131ec492e20b327a624f61c8913f6a