Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a633d6d51662ce4…

MALICIOUS

PDF

76.3 KB Created: 2021-03-28 02:59:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d509a8aff27e8ad856730c851e713344 SHA-1: 0e3cd82a589de8f6fbd032a442952bce9da640e4 SHA-256: 4a633d6d51662ce4964d2fa2492efa28337ebdbac3c1730e1cfa7c2b81cd07b9
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains an external URI and an image lure pointing to the URL https://lozipotod.ru/award?keyword=que+es+un+antivalor+pdf, which is likely used for phishing or to serve a second-stage payload. The document's metadata indicates it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the phishing lure hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://lozipotod.ru/award?keyword=que+es+un+antivalor+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393197/normal_5fed8e54c9346.pdfIn PDF document text
    • https://cdn.sqhk.co/gewewoturila/jgcjdXz/tropico_6_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497646/normal_6045e83203458.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/29288804759.pdfIn PDF document text
    • https://cdn.sqhk.co/nikofejujel/hbFZHhf/situwoludetefanukilikege.pdfIn PDF document text
    • http://sadinexiwa.mygamesonline.org/vukew.pdfIn PDF document text
    • https://cdn.sqhk.co/takivelalam/xhbjige/univers_black_font_mac.pdfIn PDF document text
    • http://piwofoterif.sportsontheweb.net/makenawuzo.pdfIn PDF document text
    • http://stroymarketmetal.ru/594577319875fkdl.pdfIn PDF document text
    • http://kuzososo.mygamesonline.org/what_is_first_angle_projection_in_engineering_drawing.pdfIn PDF document text
    • http://sovumeriwox.mygamesonline.org/jikatuwepeperaxedifew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455381/normal_60196f63d2f8c.pdfIn PDF document text
    • http://xtrading.buzz/thermo_king_evolution_service_manualjjw1z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/how_to_get_better_at_small_talk_at_work.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/66422099354.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/vidmate_movie_app_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/elevador_de_cangilones_calculos.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/cartoon_tamil_song_status_video.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/oedipus_rex_character_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/50161386825.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/the_rising_of_the_shield_hero_light_novel_volume_8.pdfIn 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_off0000f456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF456 5156 bytes
SHA-256: 322f205ab798f20e5192a89316c50d25317d5c35cf678d40fb0f9054fc1db5e7
font_01_sfnt_off000105f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F4 11776 bytes
SHA-256: 9f04717f576d06ac1a7f8884eea8bc017343633ab0e1c87c9841ac8f04c7918a

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