Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a493c787954efa4…

MALICIOUS

PDF

77.2 KB Created: 2021-04-12 15:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 92d65abf17be371dce5cfda1f2b31d07 SHA-1: 51b3a2d0d99840f9248123d899617b6cf8034474 SHA-256: 3a493c787954efa45fd1a3470486318efbea6d93f68d5f3032d5d8330a50d504
186 Risk Score

Malware Insights

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

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 0.9991

Heuristics 6

  • 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 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.
  • 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://pelibifir.ru/strik?utm_term=when+was+the+remington+11+48+made PDF link annotation
    • http://xizerunax.scienceontheweb.net/3836323110.pdfIn PDF document text
    • https://cdn.sqhk.co/tigoxexuda/fjhKuig/gestor_de_archivos_apk_premium.pdfIn PDF document text
    • http://ladiluvame.mypressonline.com/xirifebokakesajatimovu.pdfIn PDF document text
    • http://derewopenila.22web.org/mathematics_questions_for_class_8.pdfIn PDF document text
    • http://kixogabes.22web.org/12529612350.pdfIn PDF document text
    • https://cdn.sqhk.co/lexelinowe/gdjdWie/governor_of_poker_2_full_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kezulegol/csiOidi/pluralist_approach_to_industrial_relations.pdfIn PDF document text
    • http://kinemulawaw.sportsontheweb.net/flushing_meadows_corona_park_map.pdfIn PDF document text
    • https://cdn.sqhk.co/wemojezuvegi/zRbhZgf/canonical_transformation_solved_problems.pdfIn PDF document text
    • https://cdn.sqhk.co/poturofivat/hgSjbVx/blue_contacts_icon_png.pdfIn PDF document text
    • http://dazavaluk.mygamesonline.org/tejikuzutizanolig.pdfIn PDF document text
    • https://dutesemo.weebly.com/uploads/1/3/1/6/131606066/kovedejoso.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/STHihac/zukunopujulidemezonowu.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/ge8jiih/mavedimopedamasew.pdfIn PDF document text
    • https://cdn.sqhk.co/piwizogir/ibji5ge/59110726162.pdfIn PDF document text
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/wopobamux.pdfIn PDF document text
    • http://lipexifinidoda.scienceontheweb.net/dalobas.pdfIn PDF document text
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/269fc98.pdfIn PDF document text
    • https://cdn.sqhk.co/jumosanex/yjgRgdj/pilajekowutarodakekulof.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/ef7b1aa9ac5ac.pdfIn PDF document text
    • https://cdn.sqhk.co/reromiwo/7nhisgc/baby_i_m_amazed_by_you_lonestar_chords.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_c95abf647bf44836b5a0a9b57b2fa997.pdf?index=trueIn PDF document text
    • https://eb22cd64-ba88-4d74-9269-d2b8937e52af.filesusr.com/ugd/3b217d_45207efac781446a96e2f654cf377cbf.pdf?index=trueIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_01b2f6901abc4e5fa2b42aa51fd5ebb5.pdf?index=trueIn PDF document text
    • http://gonezoz.rf.gd/what_is_the_best_free_calorie_counting_app.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_off0000ecf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF5 5644 bytes
SHA-256: 6631d8ae1c20d6855a945297c5636c09147325a14a30fe9f7d410ac2bd989f65
font_01_sfnt_off0001001a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001A 11332 bytes
SHA-256: 7651dda58cedf14da12316ed8123a42290b00b56842cf8491c1613b4ffb1771b