Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9382015aff5d50…

MALICIOUS

PDF

76.6 KB Created: 2021-05-04 12:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5f6b1dfcbf3a9254412baeacfb1dede7 SHA-1: 9584fe533cf462ab2f53094a137977c5e7cbfa41 SHA-256: db9382015aff5d50c956e4b678c69da744206e8defb033dd8829cc50d8d4c91b
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 0.9997

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.
  • 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://xezojetit.ru/strik?utm_term=integration+of+cos%255E2x%252F1-sinx PDF link annotation
    • https://cdn.sqhk.co/fefowofuk/gcgegdH/dukukajizevoxozode.pdfIn PDF document text
    • http://ledozikatiresev.scienceontheweb.net/67028302856.pdfIn PDF document text
    • http://zasufigonibat.getenjoyment.net/3207758831.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/pleasure_without_conscience_meaning_in_telugu.pdfIn PDF document text
    • https://cdn.sqhk.co/wesaduleb/w48iaOC/5756424689.pdfIn PDF document text
    • http://d-youtube.com/95867170715ho7dz.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/ijgjbge/37451315709.pdfIn PDF document text
    • https://cdn.sqhk.co/mevexobuzur/iHCjhCp/utah_national_parks_road_trip_planner.pdfIn PDF document text
    • http://instapriz.online/phone_ringtones_free_download_mp36mleb.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikagisato/DXgdgel/hobby_lobby_coupon_free_shipping.pdfIn PDF document text
    • http://pestore.pro/pabumifunus9nnw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_c759d22f3f7947f5b6cec1c166753d9a.pdf?index=trueIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_13798f46dda744e4acdf3fdbc1191b5b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/935f5897-bb5d-48b9-814e-f1ac216958c5/cronicas_de_una_muerte_anunciada_libro_completo_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbec7890-3d4d-4de3-a957-296a72a4b712/49551787983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecab1b22-8587-4701-8c84-f12c1eb240fb/noxalotiweb.pdfIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_99b76bd976a54afdadc1e747d2d9e964.pdf?index=trueIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_376d14e2ce994b7f81e360a6ef4dad9b.pdf?index=trueIn PDF document text
    • http://dafukip.myartsonline.com/juzivase.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_off0000ced2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED2 5324 bytes
SHA-256: 666d8f03ce1701f9ff663c2de4a251a012d5478b2bbfd6c94fb8ad86985ca06f
font_01_sfnt_off0000e12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12A 14684 bytes
SHA-256: 5bbc76c410916bceddde6764ae7fa486c90c57b3065724b1c4055abece8c2685
font_02_sfnt_off0001106b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106B 16080 bytes
SHA-256: a534b91c4ec3d8756e3a834051570443c69e75f38d6508a28567570861ffac3d