Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4c5ea413798962…

MALICIOUS

PDF

80.2 KB Created: 2021-09-24 00:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ceea25daedafe0e81825d58bbc6fcb31 SHA-1: 4ed0b7fb33b6af678a7f700578f1367b6e80f8c9 SHA-256: 8d4c5ea41379896294cd27c1b5a2a8b34fe0504b639d769f86ebda58e1b047d4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many of which are part of a link farm on disposable hosting, suggests a phishing or malware distribution scheme. The document body is heavily obfuscated, but the heuristics point to the primary attack pattern of directing users to download potentially malicious files via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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 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://krisoc.ru/uplcv?utm_term=download+galaxy+labs PDF link annotation
    • http://iehyun.com/editorupload/file/21795305526.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137387daf353---6645817260.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/vijukipodafekanap.pdfIn PDF document text
    • https://keongracun.org/contents/files/7505966120.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/99795653982.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/zovevuxaj.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/74843593393.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/vaxekedapubodajanaf.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/wexidi.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/jefiseregomuvadowijepetes.pdfIn PDF document text
    • https://pkmoscow.ru/ckfinder/userfiles/files/92519685449.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210913113303384.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109060036288208.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/derupupubadigimuwot.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/dewolo.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/jatomegatezejaweli.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613226908b884---57296266180.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/25844830762.pdfIn PDF document text
    • http://yonetim.e-cari.com/upload/files/19097755234.pdfIn PDF document text
    • https://istanajp.com/contents/files/86823137102.pdfIn PDF document text
    • http://imoroz.by/upload/file/74528104702.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091913013482.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/96355824607.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53B 17804 bytes
SHA-256: 22273a6fe9032aa0f8c3d1ec9fb09187893650cdbb241323dae259133ef2a7b0
font_01_sfnt_off0001037f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 10444 bytes
SHA-256: ba2d878274ba90057d23e5b4659c2f495ac803a47bdc105b4e919ad0eb868e23
font_02_sfnt_off00011b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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