Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f456e5c2d5272c…

MALICIOUS

PDF

66.8 KB Created: 2021-02-07 08:17:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 592c546f30192ceb0f91e0fbc788326b SHA-1: 208ba4ae9d795067f1c8548f93e36217769971c7 SHA-256: 44f456e5c2d5272cedff383388e2ee6fb67f8b1d456209c470421970277752c1
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/aws?utm_term=craftsman+belt+driven+garage+door+opener+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412174/normal_6016fb5822ef7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5fd1a02d35e0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501804/normal_5fc7c10e2ad1a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402478/normal_5fdfdfaa7c1fe.pdfIn PDF document text
    • https://nazuvunu.weebly.com/uploads/1/3/4/4/134438845/28bea93009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_5fd09e3cbb53e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486534/normal_5fee11f60f649.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/nowokil/schindler_s_list_soundtrack.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/freestyle_wrestling_score_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/kuvitexovuganavoko.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/lonugiradavawesonu.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/jamoputikozasomuvegudape.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/anchorage_school_district_sports_physical_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/liverpool_salzburg_bleacher_report.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/urticaria_cronica_espontanea_tratamento.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_off0000ca0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0D 5468 bytes
SHA-256: 8784ac0c676c15f749545d4394962190ffbc1cfc855cd2963e28fbed0f3d2112
font_01_sfnt_off0000dc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 9816 bytes
SHA-256: 2f1a91ba61e7199e761b5c1a7c5017dc6050ce3fa650410e4a433f64931b0b4e

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