Malicious PDF — malware analysis report

Static analysis result for SHA-256 21142a8f73f850f2…

MALICIOUS

PDF

98.6 KB Created: 2021-03-20 05:32:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 034b8eca864cfc03cca3208a7cb8007b SHA-1: 30c5ac198fbd9c22d8862884d964e435821fb68a SHA-256: 21142a8f73f850f2f3496123ebc476a9524308d581229afd56ce910cd1521cbb
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/123?utm_term=action+essentials+2+free++zip PDF link annotation
    • https://cdn.sqhk.co/vilitemeru/UCHjbia/zidavijavirabokuw.pdfIn PDF document text
    • https://vobinuxidixuf.weebly.com/uploads/1/3/4/4/134471365/37dbc7fc9b0d.pdfIn PDF document text
    • https://cdn.sqhk.co/dobulefipuji/aicjj2n/color_quest_ar_mod_apk.pdfIn PDF document text
    • https://bevibobozile.weebly.com/uploads/1/3/4/7/134700853/e1b39bc.pdfIn PDF document text
    • https://cdn.sqhk.co/romumoxoleno/fgigdD0/89467648871.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/hejc6P9/60168233845.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/bifidodexif.pdfIn PDF document text
    • https://nerutaraludu.weebly.com/uploads/1/3/4/6/134672403/velulekodawilazele.pdfIn PDF document text
    • https://fibutoledul.weebly.com/uploads/1/3/2/7/132741024/8668549.pdfIn PDF document text
    • https://cdn.sqhk.co/birugafomafo/aneBIha/snappers_menu_with_prices.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/24d8fa56-d7a9-40a3-8b9e-047814d12f9c/56348211807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc6e9c0d-da19-4b2a-b858-eb52d753ac7d/possessive_pronouns_spanish_quiz.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/40503279961.pdfIn PDF document text
    • https://38c8c62e-1823-4c1e-8220-bc61efcc8a1c.filesusr.com/ugd/c24b9b_d023c2f1eab24954a434f4f3164cb178.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86450764-4dc6-40ea-88a0-1416434c2e0a/sas_interview_questions.pdfIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_06586583b8df4c6f87eae16bd86c027b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faxaxos/libros_del_cambio_climatico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f1a79ba-bbcd-4340-b277-9acaf44cb312/sezujaturawum.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013f0d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13F0D 26840 bytes
SHA-256: 801afa161a89aa1a9c8ddc5147bc20bcf93e987c111b98af909e105260ebc277
font_00_sfnt_off0000f970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF970 3568 bytes
SHA-256: 46ea3172c1e09d5c0312bf100723f9c9affbd592dbd4eee9b6f67b34bb0c050d
font_01_sfnt_off00010623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10623 4968 bytes
SHA-256: aa08e5c33a582e305bad861a7da4d72d86f955f11938d392923acaa7dd8abea3
font_02_sfnt_off0001170f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170F 11652 bytes
SHA-256: 1b73f90ddcf64a383bf9615e511474fb9888dd755e19116e611cd554c7f27967
font_04_sfnt_off00016e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E21 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378