Malicious PDF — malware analysis report

Static analysis result for SHA-256 89860e17b9132463…

MALICIOUS

PDF

93.3 KB Created: 2021-05-25 10:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1cdd485deb180b062cb8d46d59519f93 SHA-1: a79412adc38a7380da0ee70057b574abcb0413fd SHA-256: 89860e17b91324633f23d6582abffc5d59047ac35c125abe6ee23cf6265f5765
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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 0.9989

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://baarspo.ru/strik?utm_term=puffin+browser+for+android+tv+box PDF link annotation
    • https://pojojozujivalim.weebly.com/uploads/1/3/1/1/131164399/guzobu_sajedi_fimorev_weladaginutujib.pdfIn PDF document text
    • https://dururamud.weebly.com/uploads/1/3/4/8/134846475/640032.pdfIn PDF document text
    • https://kapavumir.weebly.com/uploads/1/3/5/3/135313873/ribudomarejuzuwetot.pdfIn PDF document text
    • https://vajefusuvujob.weebly.com/uploads/1/3/4/4/134464162/rinuv-dukuzugomufosin-mebaki-velemuzimevuxew.pdfIn PDF document text
    • https://baboromet.weebly.com/uploads/1/3/1/6/131606353/gajumiwajufo-leriguwinepemim.pdfIn PDF document text
    • https://kidivine.weebly.com/uploads/1/3/4/5/134576756/c92a325cc3caa9.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/422bb0.pdfIn PDF document text
    • https://xomivevisavuwog.weebly.com/uploads/1/3/4/8/134852088/ritogetuleku-somakogosiv-takanewezoma-xusisafowe.pdfIn PDF document text
    • https://ramokazadi.weebly.com/uploads/1/3/4/4/134470245/fejixutulowedajuwe.pdfIn PDF document text
    • https://tigigedilopufam.weebly.com/uploads/1/3/5/4/135400960/junojelawepev.pdfIn PDF document text
    • https://gorenusedom.weebly.com/uploads/1/3/5/3/135326887/navofonenab.pdfIn PDF document text
    • https://kifikutomile.weebly.com/uploads/1/3/0/7/130776046/rugekesari.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/0492a8ab-9fee-4984-b91e-fa6425b35c91/88792644496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c11c0af-9a41-4f2b-8151-3fe25827039d/vezosakulugipivukuwit.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/98491604307.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/simplifying_algebraic_expressions_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/cv_format_for_job_application.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/thug_kitchen_enchiladas.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/20168223536.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/effective_interpersonal_communication_skills.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/singapore_math_1b_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/mission_impossible_theme_song_sheet_music_viola.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/chori_chori_movie_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/moto_g_2nd_generation_battery_price.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_off0000f20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20A 19068 bytes
SHA-256: a6e1a690f9e0f851601c4e8945d5b60371b996833185a29fdff0e4c9a2cd7312
font_01_sfnt_off00012d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D69 5228 bytes
SHA-256: 4e9c23f07d1b9d94cfd9719fa13af5d6ee528bf003b4671cf72f1a6431bb0574
font_02_sfnt_off00013f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F59 11052 bytes
SHA-256: 94ca402c0893b05dab01afc999c49738accb661f10e085d6a3ab89ada26c7592