Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f389a27fcab1f17…

MALICIOUS

PDF

70.3 KB Created: 2021-03-04 01:50:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 1c72e61f3d57b329909a08397152eef9 SHA-1: 86034042fb92dccda8bd7a0fc62b7b4fead02ae5 SHA-256: 3f389a27fcab1f171209d512f7bc76365082518be16d3e0f0a64d3e4060da0e3
196 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
  • 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.
  • 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://gimoguvi.ru/award?keyword=math+makes+sense+textbook+grade+5+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380078/normal_5ff4da38ad2db.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/1fa91db.pdfIn PDF document text
    • https://manumuxalobo.weebly.com/uploads/1/3/5/3/135387638/2493965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501993/normal_60208a9a19c2b.pdfIn PDF document text
    • https://tazesarazuf.weebly.com/uploads/1/3/4/7/134726557/gotemumijofo-pututubidejamo.pdfIn PDF document text
    • https://dowogejur.weebly.com/uploads/1/3/5/9/135992185/6363525.pdfIn PDF document text
    • https://xefafarorul.weebly.com/uploads/1/3/4/6/134698093/fakivagituforijofugi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481275/normal_5fe8f712c1f2e.pdfIn PDF document text
    • http://lenulari.mypressonline.com/77248687366.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/wekibik/.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/28372477555.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/23333787394.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/metronome_sound_wav.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/open_outlook_template_multiple_times.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/simplasto_e_apoplasto.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/vagasuma.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/lecture_ready_3_second_edition_answer_key.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_off0000ccb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB4 5824 bytes
SHA-256: a18748a2b6046053c44e1772714d9f96c7ee75f318cfe553b11d977bb94ea0c9
font_01_sfnt_off0000e06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06F 13800 bytes
SHA-256: 8856f74b4b3989d1875e479cf3b83c8ca1018a5f63181eaa062addb0555fb098

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