Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2cc4adb57b199c…

MALICIOUS

PDF

65.6 KB Created: 2021-01-16 16:39:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ebd3aa1b55333e64d1ef675c46dc99a0 SHA-1: 273f90cca5f487c40575481d5f11acf4589b21f9 SHA-256: ca2cc4adb57b199c91992add990c4c335991299a9c46bb187133cb83cf00459d
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/aws?utm_term=reflection+maths+worksheet+ks2 In PDF document text
    • https://jutulomivepira.weebly.com/uploads/1/3/4/7/134775876/6e77206.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/sojopemebulot_lapejawakeb_sifasetuf_busuriwogo.pdfIn PDF document text
    • https://zizuralozirufu.weebly.com/uploads/1/3/1/4/131483034/tonudiwunakila.pdfIn PDF document text
    • https://wanezevidika.weebly.com/uploads/1/3/4/5/134588498/a165424d1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454047/normal_5fbee91de1e6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378599/normal_5feb00f54bb38.pdfIn PDF document text
    • https://sopivumebisul.weebly.com/uploads/1/3/1/4/131413603/13e24b7bf95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476142/normal_5fb491b98d00a.pdfIn PDF document text
    • https://wimafepe.weebly.com/uploads/1/3/5/3/135326366/sopuwe.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/bezutu/zaxorubo.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/friend_zone_thai_movie_eng_sub.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/adm_apk_pro_cracked.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/mekinow.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/bhaktamar_stotra_lyrics_in_gujarati.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/biological_conservation_author_guidelines.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_off0000c428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC428 5416 bytes
SHA-256: c6f5c35ddc8cbd522f1adc9ec74b63ad5b863953dbcb1d3b4980b2d3acabc21a
font_01_sfnt_off0000d67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67C 10432 bytes
SHA-256: d22deb7649ab65945bfae761b5d1cb814ab374a78aecbd115880a3c304b8212f

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