Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3bbf2164644a5f…

MALICIOUS

PDF

86.3 KB Created: 2021-03-01 05:57:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 01e2776afdade31cf6d1efe2a6211ca7 SHA-1: dcd732ce0be199d032301561193bdf4912bb16c8 SHA-256: 1d3bbf2164644a5f7692748af3eea54ad7018a09fb822803762281249a8652f9
126 Risk Score

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 0.9997

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://soxebez.ru/123?utm_term=ds2+best+strength+faith+weapon PDF link annotation
    • http://chaptejvxz.fun/null_s_brawl_stars_iossd7ah.pdfIn PDF document text
    • http://goproonly.com/predicate_nominative_and_predicate_adjective_worksheet_with_answersrwbg2.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/fluke_435_ii_analyzer.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/jane_eyre_article.pdfIn PDF document text
    • http://lusivemewuza.22web.org/apply_for_teacher_job_application_format.pdfIn PDF document text
    • https://zisefedid.weebly.com/uploads/1/3/4/7/134767142/gozibefefa.pdfIn PDF document text
    • http://zekojotewakugag.mypressonline.com/rowasavi.pdfIn PDF document text
    • https://musokolej.weebly.com/uploads/1/3/1/3/131383826/dekil-tudozemogutemik-wosebiz-kiwow.pdfIn PDF document text
    • http://modezewop.mygamesonline.org/36502906669.pdfIn PDF document text
    • http://xegazinijitup.mywebcommunity.org/surah_al_mulk_quran_transliteration.pdfIn PDF document text
    • http://fiwazurenorin.iblogger.org/sat_practice_test_1_answers_kaplan.pdfIn PDF document text
    • https://daxuvevirub.weebly.com/uploads/1/3/4/0/134013438/naxejoxalot.pdfIn PDF document text
    • http://good-production20.site/873120398147fdmb.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
    • https://s3.amazonaws.com/rurovikejigibu/zotuzuvegalilixomimige.pdfIn PDF document text
    • http://jipudovisubu.rf.gd/employment_registration_form_gujarat.pdfIn PDF document text
    • http://faleferesevo.onlinewebshop.net/25219234050.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/burger_king_menu_hawaii.pdfIn PDF document text
    • http://fanunif.rf.gd/jufiruziwetubezuzukilidan.pdfIn PDF document text
    • http://gukupexokopiwug.epizy.com/zazifasigo.pdfIn PDF document text
    • http://matewedidoxeber.onlinewebshop.net/do_ants_have_antennae.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_off00010743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10743 5284 bytes
SHA-256: f2ed5219bd36ed1327c97e6abf520009c3848a7092c438d027230d6103b4e157
font_01_sfnt_off0001193c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193C 10676 bytes
SHA-256: 874277300c2cc1b2f3d0d16df15063f070f79fe5d1207b94eb31946e47748c81
font_02_sfnt_off00013da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA4 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e