Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82e506e566caa94…

MALICIOUS

PDF

81.1 KB Created: 2021-05-06 09:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b1a0760f8b52e2040a073fe155954942 SHA-1: dc59f4d6f4e19dab3dd9785d206d6160cbb6cfc8 SHA-256: b82e506e566caa94ee992ad1fac058d56857a7836fa291c152d4e28295e3cb47
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9996

Heuristics 5

  • 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 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://maypoin.ru/wb?keyword=ielts%20academic%20writing%20essay%20examples PDF link annotation
    • http://pomirkapa.site/dividing_monomials_worksheet_7-_2zvxxu.pdfIn PDF document text
    • http://repochka.site/cdl_general_knowledge_practice_test_ny_spanish0ckmm.pdfIn PDF document text
    • http://lejuxetuvi.iblogger.org/verbals_worksheet_middle_school.pdfIn PDF document text
    • https://cdn.sqhk.co/tuledapozato/a7uhdQp/solitaire_relaxing_card_games_online.pdfIn PDF document text
    • http://profer-opt.ru/bts_albums_freeenufq.pdfIn PDF document text
    • http://coupons2020.info/717736003704u8cl.pdfIn PDF document text
    • https://cdn.sqhk.co/movozuba/ia7gegd/ripebi.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/bolvojg/adventure_escape_mysteries_trapmaker_3_chapter_7.pdfIn PDF document text
    • https://cdn.sqhk.co/banibudofe/Yhjicgj/33523363071.pdfIn PDF document text
    • https://cdn.sqhk.co/zolususux/hbifpif/joparozanejurapakela.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/Dnhb0he/outdoor_basketball_court_design_slope.pdfIn PDF document text
    • http://galoomer.online/medical_statistics_for_beginnerstlksm.pdfIn PDF document text
    • https://cdn.sqhk.co/leburogutu/4ijhjyh/b_52_bomber_restaurant_costa_rica.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb511a17-89bd-40f1-8d30-4354eb130e7d/moko_bluetooth_keyboard_pairing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4977464c-b597-478c-9f93-855952fbae89/bibewilatewenupaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fb3a0d7-3b59-4e7c-93c9-655b4a23a348/powerpoint_on_figurative_language.pdfIn PDF document text
    • http://sedoguzod.rf.gd/jatevakul.pdfIn PDF document text
    • http://lesexugisitu.rf.gd/dilog.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/king_lear_act_3_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/mopejufimarixige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a0d7152-06b1-4371-ad86-cba8b06197f0/particle_physics_lab_machinery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f9af65a-c5f8-4fb7-93ec-d0df8091fdbd/can_i_get_my_drivers_permit_during_covid_19_california.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBD 5592 bytes
SHA-256: 06279df7a056ab762946b7f71bf5ba2f4cdf51e7211b94e99de7bf7b3874c7a3
font_01_sfnt_off000112cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CF 10520 bytes
SHA-256: 31e0050877cd065a3a872e5bb82055b7f9aa33b622c13fd41d2eee52da649bd6

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