Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eec9cc6ae5c4cf0…

MALICIOUS

PDF

72.7 KB Created: 2021-04-02 10:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 00166ae72311a0656f070ea54850e17d SHA-1: 076c1cd65de5c3f9ba110471b3a3a21b788eb1e2 SHA-256: 5eec9cc6ae5c4cf011f36f72d753b11654def9696f7d4a6310a8561f14619685
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The presence of the URL 'https://midufefew.ru/award?keyword=inheritance+of+blood+groups+pdf' and numerous other links suggests an attempt to drive traffic to potentially malicious or deceptive content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/award?keyword=inheritance+of+blood+groups+pdf PDF link annotation
    • https://cdn.sqhk.co/wawabosamugo/hajfZjc/android_app_development_course_for_beginners.pdfIn PDF document text
    • https://lenololiwi.weebly.com/uploads/1/3/4/4/134455370/wexodex.pdfIn PDF document text
    • https://cdn.sqhk.co/mivijigonof/BbMsjin/extreme_landings_game.pdfIn PDF document text
    • http://neyroskakalka.site/aonde__feriado_dia_20_de_novembro581tb.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/hrxjehh/yellow_wallpaper_questions_and_answers.pdfIn PDF document text
    • http://groshyk.site/ronetedovulixecwwr8.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/ieosgfC/adventure_escape_asylum_chapter_10.pdfIn PDF document text
    • https://jekufagiz.weebly.com/uploads/1/3/0/7/130739150/262367.pdfIn PDF document text
    • https://pikiravu.weebly.com/uploads/1/3/4/3/134347639/6c25cef5dcda05.pdfIn PDF document text
    • http://gipeturira.22web.org/logan_airport_terminal_map.pdfIn PDF document text
    • https://toxejezewigi.weebly.com/uploads/1/3/4/5/134513259/kopumabumefir.pdfIn PDF document text
    • https://cdn.sqhk.co/felinavaw/eUgjhgg/kejakazegipuvixemomedifos.pdfIn PDF document text
    • https://cdn.sqhk.co/pulisamog/ejbgiqX/78970639376.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://letozin.rf.gd/67654587157.pdfIn PDF document text
    • http://gutezapirasawad.rf.gd/accident_report_parker_colorado.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/52721191721.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/android_mobile_os_version_history.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/79214036607.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/73034707176.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/kafimejol.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_off0000dd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7B 5492 bytes
SHA-256: 3f0549f82a02a798ea859750a83edba13ecbd9f849fba7de8fdafbc039f1fa14
font_01_sfnt_off0000f01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 11156 bytes
SHA-256: 45db8eecb16c2593f9cd0d8c397a6dc7985c0ba3ed771f2e49f23ac78eb43705

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