Malicious PDF — malware analysis report

Static analysis result for SHA-256 16643856634248a1…

MALICIOUS

PDF

79.2 KB Created: 2021-04-16 02:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aaaa8148c7cf54e6bea15e328900a986 SHA-1: 5123c67df404e3bad9e96b258d801e687faab718 SHA-256: 16643856634248a1a2449e9a2d324cebedbab41b7f4ac79ad67028902473568d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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 0.9993

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://zajinet.ru/strik?utm_term=mozilla+firefox+48+download+for+windows+7 PDF link annotation
    • https://cdn.sqhk.co/jubawiwa/SjcuHlq/vertical_challenge_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/nigezufi/ejcPhbu/dajopaxaloweges.pdfIn PDF document text
    • https://cdn.sqhk.co/botikavanov/iOSgcie/un_sustainable_development_goals_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/haiigEP/26646948639.pdfIn PDF document text
    • http://xaraxag.mypressonline.com/viwatalabunebul.pdfIn PDF document text
    • http://vikolumubibo.scienceontheweb.net/encyclopdie_de_la_charcuterie_gratuit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/auntie_tay_mickey_ears_template.pdfIn PDF document text
    • http://kiwimodilumipov.epizy.com/gevibomezelokaf.pdfIn PDF document text
    • http://resodexapok.rf.gd/betrayal_at_house_on_the_hill_haunts.pdfIn PDF document text
    • http://bogisuxefitis.epizy.com/policybazaar_cibil_score_password.pdfIn PDF document text
    • http://govuwetubor.epizy.com/can_i_use_my_cell_phone_as_a_hearing_aid.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/what_is_design_verification_in_vlsi.pdfIn PDF document text
    • http://duxurulokij.epizy.com/xefulamuvika.pdfIn PDF document text
    • http://bazudujowirev.epizy.com/raisin_in_the_sun_mamas_dream_quote.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/where_to_get_tactical_training.pdfIn PDF document text
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_b33d8d51a83e44f8bc741af4bee17de4.pdf?index=trueIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_cece13639f5548d297525dc9a65dbe47.pdf?index=trueIn PDF document text
    • http://dajejat.rf.gd/hamilton_anxiety_rating_scale_scoring.pdfIn PDF document text
    • http://kudipam.epizy.com/what_is_piano_accompaniment.pdfIn PDF document text
    • https://s3.amazonaws.com/rizoli/action_movies_2019_mp4.pdfIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_40795e11a28f4c98b6d952a2fc88ec34.pdf?index=trueIn PDF document text
    • https://a4edf7fa-b057-49b5-8014-e5fd436fbef3.filesusr.com/ugd/c8b2c5_1a51ab7fd8444b6688c7f6f5c7e41159.pdf?index=trueIn PDF document text
    • http://dipejigiz.epizy.com/salud_y_bienestar_animal.pdfIn PDF document text
    • http://kibajopowal.epizy.com/34849470146.pdfIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_627eda1f78614d2fb2bf9a3f9dae6547.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_off0000f388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 5480 bytes
SHA-256: bb993e335412d8d5ca471e9f0ce8bc34811b834b32d9303e74558e881be2b287
font_01_sfnt_off0001067f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067F 11552 bytes
SHA-256: c7493dfb301268fee30dbe68d46f6a7bc9d4b9c17edb06f3a23822a3e4812840