Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce9b482739bc503…

MALICIOUS

PDF

79.9 KB Created: 2021-04-05 18:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e5e041db566cb11d7dac65dfb04e60ea SHA-1: d1a8cb7f7f5573d398990b2f4c68f4c42fff7edb SHA-256: cce9b482739bc503ff71b17eb7a3d7db0dc556e65ad14c19352223300e19295d
166 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, with one specifically pointing to a suspicious domain ('zajinet.ru') that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, reinforcing the malicious intent. The ML classifier and ClamAV detection strongly suggest malicious content, likely a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=cazadores+de+sombras+serie+temporada+1+espa%25C3%25B1ol+latino PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403679/normal_6059bb2d0b4db.pdfIn PDF document text
    • https://jugotogosef.weebly.com/uploads/1/3/0/8/130814460/tutisozilomipe_mojewiwugezotuf_papeviw_mirej.pdfIn PDF document text
    • http://perakaganiw.iblogger.org/cours_de_nutrition_et_sant.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/iDhaecl/scruffy_looking_nerf_herder_swgoh.pdfIn PDF document text
    • http://erogan24.website/buffers_in_biochemistrye3yyh.pdfIn PDF document text
    • http://buyfastedcircle.xyz/2097743560650ggi.pdfIn PDF document text
    • http://opsnatur.fun/quantity_surveyor_report_deductionpnuk0.pdfIn PDF document text
    • https://dawasaga.weebly.com/uploads/1/3/0/9/130969366/cd36c3e.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/pOjdgig/disney_plus_free_trial_code.pdfIn PDF document text
    • https://cdn.sqhk.co/pajijolabalu/igda3jg/phrases_to_learn_in_other_languages.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459163/normal_6043527e33b01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489042/normal_605c0afcee50a.pdfIn PDF document text
    • https://metasabuvaro.weebly.com/uploads/1/3/2/6/132681671/wafumewawexuluno.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tuxefofoxomar.epizy.com/antecedent_behavior_consequence_tracking_sheet.pdfIn PDF document text
    • http://zalowakudedakov.rf.gd/bluetooth_keyboard_for_android_games.pdfIn PDF document text
    • http://vepetisex.epizy.com/apgar_score_chart.pdfIn PDF document text
    • http://mivarotodu.epizy.com/does_dell_latitude_5580_have_a_camera.pdfIn PDF document text
    • http://kedekivotizera.epizy.com/diablo_2_median_xl_install_guide.pdfIn PDF document text
    • http://jitofatukawej.rf.gd/sepubotuxik.pdfIn PDF document text
    • http://dubovusikiwafaz.epizy.com/36408512201.pdfIn PDF document text
    • http://gamugeko.rf.gd/memorandum_and_articles_of_association_sample.pdfIn PDF document text
    • http://jofesosozofoso.epizy.com/82003637173.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CD 5368 bytes
SHA-256: 94ad4904e6ea8f4ee838c5a67ccd98a8b51e3016af1a7f8cd14c021a49a62750
font_01_sfnt_off0000fab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB8 11736 bytes
SHA-256: f2eaf4d4a2141774c0274b3bee032a95d76a4ff49dbfdaae0ac038a90adc642b
font_02_sfnt_off00012129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12129 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71