Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c6439fdb66735e…

MALICIOUS

PDF

77.6 KB Created: 2021-02-17 18:07:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5c7703d9a1f1efbf9b240cf4bc3f52b7 SHA-1: 788d409d28fbe909c2cd7747a9b4ebbf4c91cbee SHA-256: 64c6439fdb66735e3f14bfd825dccc1e9dd6a845f9968ff865335e6d7fe7128e
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. Another critical heuristic flags a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=delonghi+magnifica+s+ecam+21.117.sb+test In PDF document text
    • https://xinefozi.weebly.com/uploads/1/3/0/7/130775465/80c497599128b14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418401/normal_6014c7832d179.pdfIn PDF document text
    • https://xokebewogaxuwu.weebly.com/uploads/1/3/4/5/134588239/2fb79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370089/normal_600032ac38332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369630/normal_5fe7745b4eb2d.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/1jchdoU/37828008825.pdfIn PDF document text
    • https://ratofesut.weebly.com/uploads/1/3/5/3/135304008/mumimifi.pdfIn PDF document text
    • https://bikojeril.weebly.com/uploads/1/3/3/9/133999271/nifovagixu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414860/normal_60089bc2dd92b.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/dovulavavo/arduino_cnc_code.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/business_letter_writing_format.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/jerejesezapuwur.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/bollywood_mkv_hd_movies_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/formule_pour_calculer_l_ge_gestationnel.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/free_atmosphere_font.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/amazon_prime_video_uk_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/cie_a_level_business_examiner_report.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/54032108860.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/dopexikopade.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_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 5632 bytes
SHA-256: 1cca96812aa600d28350509084325c088fbcdbbf76a763c9ebebd2b84e39743d
font_01_sfnt_off000102ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 11196 bytes
SHA-256: daf1e25752fa4b26e8d1282f6c7d2b5f5d932f436d537c57ea08e04a9380c84b

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