Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a4ac6bc4b8cb66…

MALICIOUS

PDF

68.3 KB Created: 2021-03-01 07:11:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 11f36a206bec038cf98b35998a2e1da8 SHA-1: 229196214727aba40700267df07731c00ed877dc SHA-256: 98a4ac6bc4b8cb66a2a04c60e3fc4963d07a2347b8e5c19076294e289e75e6ab
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=peerless+transaxle+parts+uk In PDF document text
    • http://becloud.website/bibliography_mla_and_apa_formato0fwn.pdfIn PDF document text
    • https://jabiwogox.weebly.com/uploads/1/3/1/4/131453485/4028c1395b6debf.pdfIn PDF document text
    • http://najetaxu.mygamesonline.org/partes_de_un_motor_electrico_en_ingles.pdfIn PDF document text
    • http://geparup.scienceontheweb.net/42003840325.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/84530434586.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/how_to_replace_a_carburetor_on_a_troy_bilt_pressure_washer.pdfIn PDF document text
    • https://masezinonorokun.weebly.com/uploads/1/3/4/6/134685416/wobovixa_guxobuvanogux.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/paxivogedewilu/baba_balak_nath_diya_photo.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/20548931248.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/android_oneplus_7_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/gigujugosopugowumavo.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/hannah_arendt_the_origins_of_totalitarianism.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/alvin_and_the_chipmunks_birthday_song.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/indesign_dl_flyer_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/bluedio_f2_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/kexonimozujifelawo.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_off0000d146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD146 4944 bytes
SHA-256: 116e62c48cf33bf634d057b57d2c80b64166d61a1dc414900e06f611fb6c9499
font_01_sfnt_off0000e22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 10020 bytes
SHA-256: 72d04350725cb1e753c123e4e0c55bbf3c29ba904237e10b717de6207e415ab4