Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ce49bc3ab2d60b…

MALICIOUS

PDF

78.4 KB Created: 2021-02-27 16:01:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a1bde58075390c902ff1ea3b1d2bbffc SHA-1: 90d0c8dc859a7443485c1fbc61f43e5b3684a033 SHA-256: 61ce49bc3ab2d60b9d0376e1dd284beab1bb61b52fafefefd843ba142941e8d4
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/123?utm_term=breakfast+at+tiffany%2527s+movie+review PDF link annotation
    • https://pesulomerusetus.weebly.com/uploads/1/3/4/1/134109359/xudifuxusivugipe.pdfIn PDF document text
    • http://tk-pobeda.site/mcafee_antivirus_plus_with_cracko4j82.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/h0idheX/cross_stitch_pattern_generator_software.pdfIn PDF document text
    • https://femidizori.weebly.com/uploads/1/3/4/6/134684525/tirel_jivodap.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/what_is_the_price_of_32_inch_sony_led_tv.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/hollow_knight_path_of_pain_locationqbds8.pdfIn PDF document text
    • https://cdn.sqhk.co/pulisamog/egcijia/40108360745.pdfIn PDF document text
    • http://ziduzuraxiralet.iblogger.org/metformin_dosage_for_prediabetes.pdfIn PDF document text
    • http://xifadezuzurap.medianewsonline.com/can_a_humidifier_work_without_a_filter.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/hK5hche/jafupuwosumabirebovalub.pdfIn PDF document text
    • https://nugobobunebiset.weebly.com/uploads/1/3/5/3/135303429/nafuzegoj-bibumepoti-nazuvetuk-divewetudurup.pdfIn PDF document text
    • https://cdn.sqhk.co/rukububibon/hcgdhhb/angry_shark_attack_simulator_2019_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/iwoZje7/gofesimuwimemij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mosepurone.epizy.com/rujileparamajos.pdfIn PDF document text
    • http://fumaresaxebikab.epizy.com/alphabet_d_hd_wallpaper_free.pdfIn PDF document text
    • http://vekalaluno.epizy.com/11162779339.pdfIn PDF document text
    • http://lafebevu.rf.gd/brainstorming_questions_and_answers.pdfIn PDF document text
    • http://rukosivujuxu.atwebpages.com/what_to_do_when_water_spilled_on_laptop_keyboard.pdfIn PDF document text
    • http://kixavukuwowaz.rf.gd/the_best_whatsapp_status_video.pdfIn PDF document text
    • https://medlineplus.gov/recipes/breakfast/In 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_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 5284 bytes
SHA-256: fa2ff4cbbe7189512ea2c7eedb1f28617eebbc7af648be52a52522d22d9c163f
font_01_sfnt_off00010667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10667 10960 bytes
SHA-256: 350ffa9f4168c197e1a1c1ee240cf07551727f0a5daaa157a408138fa184fee7

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