Malicious PDF — malware analysis report

Static analysis result for SHA-256 68131d842df1fb3f…

MALICIOUS

PDF

76.4 KB Created: 2021-03-19 13:25:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ba3e6dd4bcfafd7ddaeca09bcf57544e SHA-1: 7eabf406d2f365f5de4b29cb7ca7e4b847b2d8b1 SHA-256: 68131d842df1fb3f2a2cc35f6c27de3042e5f76b7c956b6f89ce5baa21ac14fd
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'ponafet.ru' disguised as a driver download. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a campaign to distribute malicious content or phishing pages. No scripts were extracted from this sample, but the presence of external URIs and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://ponafet.ru/123?utm_term=acer+aspire+vx+15+drivers PDF link annotation
    • http://raffle.website/59796745976w69qa.pdfIn PDF document text
    • http://fashion-deals.xyz/bafonutanmkso7.pdfIn PDF document text
    • http://neluvukod.22web.org/nuevo_cdigo_civil_de_puerto_rico_2019.pdfIn PDF document text
    • http://goligofalu.medianewsonline.com/32727418753.pdfIn PDF document text
    • http://vukosodo.iblogger.org/wubeli.pdfIn PDF document text
    • http://vegifeda.mypressonline.com/watafofajidegibizowuxukob.pdfIn PDF document text
    • http://kind-insta.site/mccormick_slow_cooker_chili_seasoning_ingredientsh878q.pdfIn PDF document text
    • https://cdn.sqhk.co/bidusowo/SjiiiFg/rajezemoxelil.pdfIn PDF document text
    • http://wepipedudi.22web.org/amok_krystian_bala.pdfIn PDF document text
    • http://xajoboki.iblogger.org/nielsen_report_vietnam.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/JggHhhh/prison_break_season_1_episode_15_full_episode.pdfIn PDF document text
    • https://cdn.sqhk.co/selusujava/jfijnSL/miriam_the_escape_walkthrough.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://suwojib.rf.gd/how_to_do_a_risk_benefit_analysis.pdfIn PDF document text
    • http://kixavukuwowaz.rf.gd/tobuz.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/auto_tap_application_for_android.pdfIn PDF document text
    • http://vebusatoro.atwebpages.com/keniritux.pdfIn PDF document text
    • http://kewivifonawati.epizy.com/does_a_gas_furnace_have_a_reset_button.pdfIn PDF document text
    • http://jelelonu.rf.gd/2d_geometry_worksheets_grade_6.pdfIn PDF document text
    • http://lapetagalelan.myartsonline.com/qu_pan_puede_comer_los_diabticos.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/intermittent_fasting_guide_12_12.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/nesco_american_harvest_food_dehydrator_and_jerky_maker_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/pcos_metformin_and_diet_pills.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_off0000e125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE125 4820 bytes
SHA-256: 3944b12f47f9bc26cd088eebadae6e7e9b71d98f7c8eb4b4140f33457fab55fb
font_01_sfnt_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 10728 bytes
SHA-256: 2e20c12554537d1c2c5d914f80944c9d82ded14db1302fcc9f5c780bc3343e9c
font_02_sfnt_off0001163e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3