Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd81a597d8953b9d…

MALICIOUS

PDF

68.9 KB Created: 2021-02-02 07:36:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e6fc69ed9f8d58448c55df5a23fb68c5 SHA-1: 9914be259b9fd6ffe1ad3093780f4a02d5bc4a92 SHA-256: cd81a597d8953b9dbff7d0977ecdd5c09b2017674ff0a30e7684b5dbe53eef4a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to drive traffic to malicious or spam sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://jottigo.ru/aws?utm_term=afrikaans+woordeboek+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495042/normal_5ffa364142225.pdfIn PDF document text
    • https://cdn.sqhk.co/dunafafaxen/haMugfL/funny_ringtone_for_boyfriend_download_mr_jatt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499972/normal_5fff97554d3ad.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/wigvhhZ/puvozodel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417527/normal_60050da4e5888.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419857/normal_5ffb0cab18696.pdfIn PDF document text
    • https://bilokomomaxin.weebly.com/uploads/1/3/5/3/135397692/repekenefovuneziwub.pdfIn PDF document text
    • https://lefagetali.weebly.com/uploads/1/3/2/3/132302894/jimutir.pdfIn PDF document text
    • https://cdn.sqhk.co/jefigujaxev/eoKOgi1/rikekonuvumokigoze.pdfIn PDF document text
    • https://koxewezadopu.weebly.com/uploads/1/3/4/0/134017906/23a83784f.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/ghjhgAK/free_stuff_to_do_in_brooklyn_ny.pdfIn PDF document text
    • https://rezusoroporinon.weebly.com/uploads/1/3/2/6/132695427/veluveludexiwa_sagijivivu_mozus_bowabizu.pdfIn PDF document text
    • https://waxutawuvesi.weebly.com/uploads/1/3/1/4/131455398/12b77e195f4.pdfIn PDF document text
    • https://kavosoxevab.weebly.com/uploads/1/3/0/8/130874108/2346819.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/ditogavogape_gedirub_xuzuvo_bovodexu.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/damerirazib/givowevakiroxiwaxiso.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/library_cataloguing_practice.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_off0000d146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD146 5156 bytes
SHA-256: 6aa11fa20d270f0fea454d77db6ee880378008e62b5ebba661dd6e4d4e8ab719
font_01_sfnt_off0000e2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 10592 bytes
SHA-256: c7762150ac2675e9dbcb7e9f9ef31b9623be0e02b33eee134a25215c7f87e5ed

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