Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd25c495e45ecee…

MALICIOUS

PDF

106.2 KB Created: 2021-05-21 10:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 321c3aecc6666dc5d29a4d0639076fde SHA-1: 12e15d7c4ec1a7759a0fa31374fcaf869bb108e2 SHA-256: 8bd25c495e45ecee06f7b2b4ff628b1dfbd75a5809dae7135105472b4bedef51
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9777

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 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.
  • 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://seumenha.ru/strik?utm_term=compartir+archivos+en+red+wifi PDF link annotation
    • https://vigegenatiborig.weebly.com/uploads/1/3/0/7/130740049/541549.pdfIn PDF document text
    • https://nawomabikovuz.weebly.com/uploads/1/3/4/7/134730946/2556767.pdfIn PDF document text
    • https://zodebosamu.weebly.com/uploads/1/3/4/4/134444592/0466f18fb.pdfIn PDF document text
    • https://nibafowezibinax.weebly.com/uploads/1/3/4/3/134319588/kakimuk.pdfIn PDF document text
    • https://wawanuxofidote.weebly.com/uploads/1/3/0/7/130775818/redajejakebi.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/remavuj/fadimasonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce9def71-2922-4cc5-a6a8-69fd543a0c29/69842916170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c01bf05-5310-4c57-b568-a7049cd5959f/4878317336.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/cherry_tree_lane_sims_4.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/soap_web_services_vs_api.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/2571160477.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/best_app_ipad_pencil.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/guided_imagery_for_self_healing_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/mefuberoxiposasi.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/25971127091.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/canon_mx922_ink_cartridges_staples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/329fba22-5af4-48e8-b2ff-dc4ce8d09982/100_startup_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa3cf8b-5641-4d9c-80bb-ed86600a0374/spanish_subjunctive_irregulars_quiz.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/17123238252.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/what_is_the_latest_news_now_in_israel.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/dla_decision_makers_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/heartbeat_2016_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/free_handwriting_worksheets_2nd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/cancer_statistics_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/zimavujuveguwos.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/silisexoxexazikajabiwejir.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC3 6416 bytes
SHA-256: 528d1e79c27aec131c2cbf846536b85f4c117e3725d0fa982f5a85159cdab222
font_01_sfnt_off00011c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 5420 bytes
SHA-256: b18ee9554789ff03f4e17b200955daa96fbf0cd5d3f228ff3d5e71162d86348e
font_02_sfnt_off00012ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE3 11268 bytes
SHA-256: 964fa6833f6bb8a00e03316bf39c58db077dd7a6757aec51e87312b13bd06bf9
font_03_sfnt_off00015301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15301 11552 bytes
SHA-256: cdacca1950b0c2452948df21f4b57e6e8784f6bf90fdb90f8245cdb8e270df36
font_04_sfnt_off00017a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A9E 16256 bytes
SHA-256: 8cc6bcc2cf3defe0a88aedbd81e1c3d6ddceaf294630c8a268e5b6d92b2eedfb
font_05_sfnt_off00018ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FFB 1736 bytes
SHA-256: 0d9b6ab0354368cdfa5a4e52e4dfb250ede80cec4283e48fafec0a3c1c1d30df

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