Malicious PDF — malware analysis report

Static analysis result for SHA-256 d819b379d72b3843…

MALICIOUS

PDF

66.0 KB Created: 2021-02-21 21:43:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 21fe1ce9b54350c87fe6725c1ec807cd SHA-1: 705f765567106e3d6abc1c5eb210cfc4d73cefdb SHA-256: d819b379d72b3843791eddd7ca9fae99e61527ac79202ce183a5b56a6659c66d
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://seumenha.ru/123?utm_term=computer+systems+administrator+education PDF link annotation
    • https://cdn.sqhk.co/wabasenenem/ahbijWu/jemifugekojuparaxajab.pdfIn PDF document text
    • https://cdn.sqhk.co/refowofiros/bjeidCa/vimubokuruz.pdfIn PDF document text
    • http://hookup154.fun/how_to_work_fingertip_pulse_oximeterkebln.pdfIn PDF document text
    • http://hayatevesigar.online/mobogenie_apk_apk4funzr0oz.pdfIn PDF document text
    • http://scoretdho.best/60170840861k3wwk.pdfIn PDF document text
    • https://cdn.sqhk.co/gulifunanale/SzjfFhe/9742173824.pdfIn PDF document text
    • https://cdn.sqhk.co/jogujufuza/fn2jijg/black_christmas_2006_free_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/0jhSbeh/steam_gift_card_mexico.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420589/normal_5fee2be9b8f16.pdfIn PDF document text
    • https://cdn.sqhk.co/zetikitor/hjb8bgd/zoxalasaled.pdfIn PDF document text
    • https://desalipi.weebly.com/uploads/1/3/2/6/132681317/powunela-sululojirike.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/pazovugal/32400317068.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/bss_full_form_in_medical.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/games_2019_android.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_off0000c724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC724 5192 bytes
SHA-256: 64932d28ef6495f17f694a928f19a0befbdbb22ad02f6aaffc297c61e75f0d09
font_01_sfnt_off0000d8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B5 10212 bytes
SHA-256: 63fccabeee4f10d4217ef5192d368f305608744f8bc022642ce56b8459272e37