Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80f96b279151262…

MALICIOUS

PDF

90.1 KB Created: 2021-04-25 03:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b91332413ffad43558b7693ec57eb3fe SHA-1: dd601829f3386220512735dcbea705f698a606f4 SHA-256: a80f96b279151262fa9bf272c43515350bc3875ff4f15edb3cfbe699afaf4f41
196 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, employing an SEO-based link farm strategy to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and 'PDF_SEO_UTM_REDIRECTOR_LINK' specifically points to a redirector URL, 'https://jottigo.ru/strik?utm_term=how+do+i+reset+my+zebra+printer', which is likely used for phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jottigo.ru/strik?utm_term=how+do+i+reset+my+zebra+printer PDF link annotation
    • http://afracheat1.xyz/archer_hotel_napa_pet_policyj7ssv.pdfIn PDF document text
    • https://wumevevevusawu.weebly.com/uploads/1/3/4/3/134388399/5955578.pdfIn PDF document text
    • https://tobalewaluwe.weebly.com/uploads/1/3/4/4/134437424/5483185.pdfIn PDF document text
    • http://ru-en.xyz/the_boy_who_harnessed_the_wind_chapter_1-4_summarywa73s.pdfIn PDF document text
    • https://cdn.sqhk.co/zidodovare/dM4jfcM/taxajedidupewubekoluv.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/gdiirhg/slick_slime_sam_barbie_clothes.pdfIn PDF document text
    • https://cdn.sqhk.co/sasibasodiwu/Ijbv8hf/ben_10_wallpaper_download_for_mobile.pdfIn PDF document text
    • http://ersoil.fun/life_alert_vs_philips_lifelinei6mz4.pdfIn PDF document text
    • https://pamaridefudeluz.weebly.com/uploads/1/3/0/7/130776324/2463086.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/ijThc4g/judgement_or_judgment_in_america.pdfIn PDF document text
    • https://cdn.sqhk.co/lexoxuxoluvi/jgHHhex/the_sims_mobile_online_multiplayer.pdfIn PDF document text
    • http://gunodopo.22web.org/31095040658.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/dheFjeO/idle_heroes_best_monsters_2020.pdfIn PDF document text
    • http://mavisuvegepufi.iblogger.org/world_time_calculator_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pizenove.epizy.com/resting_membrane_potential_physiology.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/english_level_test_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/21439727685.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/67987569010.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/filmyzilla_bollywood_movies_2015.pdfIn PDF document text
    • http://gamovomubapo.rf.gd/android_10_galaxy_s10_release_date.pdfIn PDF document text
    • http://dalejavevofa.rf.gd/socio_ecological_model_of_health.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/narafurenorojaxuretejunit.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_off00010d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D42 5420 bytes
SHA-256: 9b062f22c049a7ce3df405d08e86694c201bb1cbae0f47f384e09865ef67da69
font_01_sfnt_off00011fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAC 11180 bytes
SHA-256: 0ad13ab5ae06c7905685db05fa35d12a7a06d517615a7e942d057b7e32c72cc9
font_02_sfnt_off000145d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D0 16060 bytes
SHA-256: 503f5200e83b189a546b6c6e1d808633a9135186956fe76ff9bd78de3d91e3c6