Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59af526549f1407…

MALICIOUS

PDF

74.8 KB Created: 2021-02-04 00:51:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: bcd4aaac3bdf44008a5e7795d0882c63 SHA-1: 240339c22f21d8390344be77a36f97f79d9e0015 SHA-256: b59af526549f1407ce79b58c20e9197569d0e0f6e4220be69c421b97d65084f0
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://yafferge.ru/123?utm_term=steven+universe+guide+to+crystal+gems In PDF document text
    • https://static.s123-cdn-static.com/uploads/4379035/normal_5ffbb3325980c.pdfIn PDF document text
    • https://roparinupiw.weebly.com/uploads/1/3/5/3/135392621/6959254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403936/normal_601b21ca59057.pdfIn PDF document text
    • http://zobebukore.22web.org/3054076751.pdfIn PDF document text
    • https://gakulenem.weebly.com/uploads/1/3/1/4/131437742/tasunirutor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528959/normal_5fd615fb4c581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428045/normal_5fe83ccd72680.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/dibululewo_nalimapi_juvewe.pdfIn PDF document text
    • http://solenaxusa.iblogger.org/31818073180.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/c2345a87211.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/lusabifef/praktijkboek_bouwbesluit_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/auralux_apk_mod.pdfIn PDF document text
    • http://dakunexafabeve.epizy.com/6718848248.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/49604233340.pdfIn PDF document text
    • http://wuwedutukuw.epizy.com/83189899978.pdfIn PDF document text
    • http://dopuviboxew.rf.gd/wall_calendar_2018_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/langerhans_cell_histiocytosis_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/58780673015.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_off0000e897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 5524 bytes
SHA-256: 1eaa218da669ff21f46a26ee9b8bbee4c9b120d48c2db2e80f6a587d58937e2c
font_01_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 10180 bytes
SHA-256: 09cdc92b3bf1db569e1f7651956b793c8426652bdf200cbc56487c9c632cb1ea

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