Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac408f5f3b163612…

MALICIOUS

PDF

77.7 KB Created: 2021-04-02 13:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 85e2581bae9d546d4641638273cd0b7f SHA-1: bd4d55ba3855ee1a5270b8b1c4fd967ed04400e8 SHA-256: ac408f5f3b1636129d2841dbeefcd8f2f94f122931c48b762125d137cc564fe7
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a high-severity heuristic for 'PDF_SEO_UTM_REDIRECTOR_LINK' suggests the document is designed as a lure, redirecting users to a phishing site at 'https://botokaw.ru/award?keyword=attendance+chart+pdf'. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attack, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/award?keyword=attendance+chart+pdf PDF link annotation
    • http://merokomazojewi.scienceontheweb.net/worldmark_encyclopedia_of_cultures_and_daily_life.pdfIn PDF document text
    • http://bafakuvim.sportsontheweb.net/pufaviribademuramep.pdfIn PDF document text
    • https://cdn.sqhk.co/wofunukasu/cZq81IT/billie_eilish_bad_guy_lyrics_justin_bieber.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/ieWhgiG/webnovel_free_coins.pdfIn PDF document text
    • http://midunetojonawiw.mywebcommunity.org/les_infortunes_de_la_belle_au_bois_dormant_ekladata.pdfIn PDF document text
    • http://vexoxem.scienceontheweb.net/airforce_x_group_previous_year_paper_in_english.pdfIn PDF document text
    • http://kuboduzuke.mypressonline.com/biomolecules_biology_class_11_notes.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/podunofo.pdfIn PDF document text
    • https://cdn.sqhk.co/gozigawefo/iajfhf6/89307725470.pdfIn PDF document text
    • http://xulodol.mygamesonline.org/physics_project_topics_high_school.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/jiwotarotavuz/3611277987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ad092be-b880-458d-a6fd-d79aa241c891/kuwet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb84c543-0cd1-4682-9792-1a639bd4edfd/73104871451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4944a7f-f813-4a80-b967-ab3286241b38/golf_is_not_a_game_of_perfect_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/96681670508.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/why_does_my_health_o_meter_scale_says_lo.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/22322406905.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/xokelowajebuw.pdfIn PDF document text
    • http://xomutojekes.myartsonline.com/cuales_son_las_propiedades_de_la_potencia_con_ejemplos.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_off0000f5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A5 5020 bytes
SHA-256: 4a12fc0c5da2ca9c8066bb3ead83ddfccb93908fbcaadd9621eddf97ae0a7c0e
font_01_sfnt_off000106b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B6 10148 bytes
SHA-256: edcda949b27e58662885091bf8ca7aca4cd5b37c5bbe6be1c46f5ddc716c9639

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