Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f78edaccc6fd3d…

MALICIOUS

PDF

69.6 KB Created: 2021-01-29 21:36:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5a75bd0fc5fd98f1c30fd2a6d68db9ac SHA-1: 2ef6330005ba252c646bb85d51d7bb1323438b81 SHA-256: 73f78edaccc6fd3d10b69220db1830417b4e77e01ad8d320a56ac35fd53ffd9d
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 identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, which is unusual for a typical user document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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=herramientas+basicas+de+la+calidad+pdf In PDF document text
    • http://milesnires.xyz/marble_2020_diary7outi.pdfIn PDF document text
    • http://reduslim-officialsite.site/ube_crinkle_cookies_for_salerpib7.pdfIn PDF document text
    • http://pubgucbayim.com/spider_solitaire_app_download5ywnn.pdfIn PDF document text
    • https://wazaxilam.weebly.com/uploads/1/3/4/7/134726650/04df8f60cd79b7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369308/normal_5fe54fc8c86f4.pdfIn PDF document text
    • https://cdn.sqhk.co/gevopobi/ggjegeo/pibitejudejumejinipadebuj.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/HsThhie/new_steam_games_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/gasawivu/agfheii/dukeleme.pdfIn PDF document text
    • https://tutuludoj.weebly.com/uploads/1/3/0/8/130874598/pobugelubibureke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460263/normal_5fe0c1f970b4f.pdfIn PDF document text
    • https://nifisutabunus.weebly.com/uploads/1/3/4/6/134634245/xexelezololopa-vexazegubafege-kufunezutu-lejudu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451971/normal_600011db9b20e.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/muxozuvalubi/2008_ranger_boat_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/sasibumosexisavadojilik.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/field_trip_report_front_page.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/never_back_down_3_theme_song.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/wisunobosefijiwedatip.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/android_emulator_docker.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/xevukojomunaxenozunojunu.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/fawutinawuw.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/51104873342.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_off0000d052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD052 5404 bytes
SHA-256: f279ad201bbade3a1f0bd235e610952bcc772547bfb6e4eccd32453c139d4489
font_01_sfnt_off0000e28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28F 11372 bytes
SHA-256: 6098b919a1c25576ceaf6aee19bd16ab6fd483241e34310fc0897c095c83ce04

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