Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4aff4d00eca5812…

MALICIOUS

PDF

82.1 KB Created: 2021-02-11 14:01:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 66a6def8d00af9c915e72ba9b6007fd2 SHA-1: ebc04cc0ac3d5172848636025c93f7d172192e1f SHA-256: d4aff4d00eca5812f13c92a8e8bf2e2f6681eb1c884962f7564f9429d195ee37
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://leonvi.ru/123?utm_term=dell+dimension+8200+max+ram PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401714/normal_602470e00ee9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454803/normal_5ff7e366a4f0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501482/normal_5fda0b7190907.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376625/normal_5ff67ae910c59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446045/normal_6011ee6f6e9f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464995/normal_5fcecfae9a1d2.pdfIn PDF document text
    • https://dimalosuzilem.weebly.com/uploads/1/3/1/4/131452887/14b4afc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385014/normal_5ff3531475691.pdfIn PDF document text
    • https://doleroxewaforud.weebly.com/uploads/1/3/4/3/134322791/360ace02e0e496.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tituroxir.rf.gd/wozetirif.pdfIn PDF document text
    • http://dodudulu.epizy.com/zogimoriganiweda.pdfIn PDF document text
    • http://bozusofofutuv.rf.gd/gcuf_degree_verification_fee_challan_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/nufog.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/shola_aur_shabnam_movie_480p.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/genetic_variation_notes.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_off0000fddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDF 5508 bytes
SHA-256: 622351892225e180c5030c8c94d9ae2fc3841f94ff8667462af410160beeaa19
font_01_sfnt_off00011088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11088 12640 bytes
SHA-256: a1f5da98c379cab76805fb96f9da1356725d1215ae37af2be4e1e9afa8cdee19