Malicious PDF — malware analysis report

Static analysis result for SHA-256 237551a4674b672b…

MALICIOUS

PDF

72.4 KB Created: 2021-02-19 15:42:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 028a6b255d510ec72d3468e87617c0e8 SHA-1: 44b2202566e0cb6cc7a556e5ba7dea7c8d8f61d5 SHA-256: 237551a4674b672b212d7ba8403ad1b1bf0fbab93bc46872f659ec53259ff06a
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=as+one+muscle+blank+the+other+relaxes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371272/normal_5ff0e61530153.pdfIn PDF document text
    • https://sezifiloxoxo.weebly.com/uploads/1/3/5/3/135348424/8435874.pdfIn PDF document text
    • http://site-shop.xyz/is_lincoln_corsair_a_good_carh04pg.pdfIn PDF document text
    • https://mutakisutuw.weebly.com/uploads/1/3/4/7/134768563/zugejipawof-vawisidobi.pdfIn PDF document text
    • http://titanovyi-filtr.ru/dekefotonuocge5.pdfIn PDF document text
    • https://fepobewute.weebly.com/uploads/1/3/5/3/135386667/fezelujudakaw_pejoweleki_dewarutar_rotev.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/ronenitevodo/platform_film_bhejo_video.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/62536792253.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/anatomia_cabeza_y_cuello.pdfIn PDF document text
    • http://dokisub.rf.gd/geico_insurance_accident_report.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/grade_12_pure_maths_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/book_report_board_games.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_off0000e141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE141 5300 bytes
SHA-256: 0b72cfe1ffc41c6a9e78dc171accca62a1fcba6baf4839c7c72828375d8c1a36
font_01_sfnt_off0000f31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31C 9956 bytes
SHA-256: a7257b264d086ca2cadc5675f317741544031232a07c2c31029d36a69fe39237