Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a2fb995037bd390…

MALICIOUS

PDF

86.1 KB Created: 2021-03-22 07:33:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dfffbd52f93adbd60dc3c12028f169dc SHA-1: d8bf2c848fb2cda11072e57437b93a33e55f744f SHA-256: 3a2fb995037bd3904879f470069cbef3391999e5498e7dd8dd87f86a365888e8
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 0.9955

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/strik?utm_term=food+chain+worksheet+2nd+grade+pdf PDF link annotation
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/b0072.pdfIn PDF document text
    • https://xonadenot.weebly.com/uploads/1/3/4/6/134685596/sezox_demoliwe_nixazukujizim_pudoxazibij.pdfIn PDF document text
    • http://romakipojaxu.mygamesonline.org/webosizezipexavi.pdfIn PDF document text
    • http://tumuduwaju.mypressonline.com/green_building_adalah.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/rigalajavoma.pdfIn PDF document text
    • https://divuvefa.weebly.com/uploads/1/3/4/7/134759037/birebemol.pdfIn PDF document text
    • http://bokogukonum.22web.org/what_replaced_the_ruger_sr9.pdfIn PDF document text
    • https://pelabomorifij.weebly.com/uploads/1/3/4/6/134628360/8182962.pdfIn PDF document text
    • http://goduvide.22web.org/butalbital_acetaminophen_caffeine_davis.pdfIn PDF document text
    • https://fobamenowukar.weebly.com/uploads/1/3/4/4/134485242/fikupox.pdfIn PDF document text
    • http://wefilevazobakeb.mypressonline.com/where_abroad_is_hot_in_april.pdfIn PDF document text
    • http://bopolubolef.mywebcommunity.org/sap_payroll_process.pdfIn PDF document text
    • https://pijawofixogut.weebly.com/uploads/1/3/4/0/134017865/43f69e.pdfIn PDF document text
    • https://famunekagazata.weebly.com/uploads/1/3/4/4/134463602/tulopuru-xaferim-marofasu.pdfIn PDF document text
    • http://dixojele.22web.org/69102510935.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bugutaj/nufagegopepawegisazemu.pdfIn PDF document text
    • http://donijexufenu.onlinewebshop.net/where_to_buy_wahl_clipper_oil.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/kizixulerofojavumiropipa.pdfIn PDF document text
    • http://bumurulepowele.myartsonline.com/general_aptitude_questions_for_gate.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/zedikagimozokododazanas.pdfIn PDF document text
    • http://levewome.epizy.com/bmo_investorline_authorization_to_transfer_account_form.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/aeneid_book_3.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/affidavit_of_loss_sss_id_format.pdfIn PDF document text
    • http://ribusanimowetud.rf.gd/election_result_2020_download.pdfIn PDF document text
    • http://duziroro.myartsonline.com/animals_names_list.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/free_whatsapp_gb_latest_version_2019.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 5628 bytes
SHA-256: ccfd606f6f20493df62ae94bee473473d2f27042cef40f04c3c67c22a46522c4
font_01_sfnt_off0001107d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107D 10524 bytes
SHA-256: 48a49f8bb3d7eeb98804fae0a4554058a90ae604bff92f50284fdd0c03295664
font_02_sfnt_off000134a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A5 16296 bytes
SHA-256: 15128285344048d76b584a6587ab2ccb2c75eee889948d4c665368cae9e92c8f