Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4ab97c7e127835…

MALICIOUS

PDF

71.7 KB Created: 2021-02-24 09:12:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 1567aa376bcbf0e988cc9b483c6d08d2 SHA-1: 06caf24cf350a78ec6be582a4a2f84d7913cef5e SHA-256: 4e4ab97c7e12783588c6b41961b18fd7d1ec5a1aa9656dcb0fd2c5d2bdf44d64
204 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/wb?keyword=autocad%20drawing%20viewer%20free%20download%20for%20windows%20xp PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380393/normal_60193689def60.pdfIn PDF document text
    • http://stav-games.ru/442370519374hheu.pdfIn PDF document text
    • http://bet-info.ru/introduction_to_probability_theory_and_stochastic_processes042zc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414851/normal_6016faab0d05e.pdfIn PDF document text
    • https://kokezixunilo.weebly.com/uploads/1/3/4/0/134096179/pumuxapifazab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guxodolabisiruj.epizy.com/cristianismo_primitivo_engels.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/carbonatao_forada.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/evenflo_car_seat_straps_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/tanojolasi.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/56940899809.pdfIn PDF document text
    • http://godutiliwaganos.rf.gd/barbie_doll_game_karo.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/91055896514.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/callaghan_college_wallsend_uniform.pdfIn PDF document text
    • http://jizofaludem.epizy.com/tone_chicken_bouillon_cubes_nutritional_information.pdfIn PDF document text
    • http://zanukabijegur.rf.gd/mcdonalds_allergie_informatie.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_off0000d9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D5 5532 bytes
SHA-256: e8ec4fbde2f5e3d3e463c09677a147111e86c15857800595ed6c1820a2e6ae1e
font_01_sfnt_off0000ecdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDC 11224 bytes
SHA-256: e0b6a11d3b656fd45aa6580399356245a9fe4ed4228756526a11f7ee7b1c9096