Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9a04d236c12c1b…

MALICIOUS

PDF

89.7 KB Created: 2021-04-03 17:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c58019c539781cb5a32c0d786b01be7b SHA-1: 9b541128465a4ab112cfd0faba18c86b0fa397c2 SHA-256: 8c9a04d236c12c1b521bf3aa5487b4eed2a0178381f0059672e1126f265a4d19
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed and point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious content or phishing sites.

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://xezojetit.ru/award?keyword=av+fistula+complications+pdf PDF link annotation
    • https://sadepejeriroxet.weebly.com/uploads/1/3/5/3/135337628/kereluwatiz_jobed_soroziga_wujemem.pdfIn PDF document text
    • http://megiloreb.mypressonline.com/nexagifakalawogoben.pdfIn PDF document text
    • https://karinerojefemof.weebly.com/uploads/1/3/0/7/130775135/647fcef7031.pdfIn PDF document text
    • http://verification-help.business/trail_climb_hack_apk_1._20be144.pdfIn PDF document text
    • https://cdn.sqhk.co/gixezovof/aiTgfHF/37638197682.pdfIn PDF document text
    • http://ruzamaji.getenjoyment.net/feature_article_example.pdfIn PDF document text
    • http://arendagg.xyz/42991613319ckue5.pdfIn PDF document text
    • https://cdn.sqhk.co/zegofurop/XAHDgeq/58811392090.pdfIn PDF document text
    • http://spencermcman.us/common_latin_phrases_in_law430o0.pdfIn PDF document text
    • https://dugegedop.weebly.com/uploads/1/3/4/3/134338267/relujuvojunafetubaw.pdfIn PDF document text
    • https://cdn.sqhk.co/didatife/7YF9k4X/17421384695.pdfIn PDF document text
    • http://xamawigokoke.mygamesonline.org/isis_unveiled_madame_blavatsky.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/kozibowisenatu/padman_full_movie_in_tamilrockers.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/78235643536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef0e43b-d5bc-455f-be12-edae3a93eaa2/woluvigilizidigezenunove.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/zoxazubuxetakewixegelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07c9dd56-c012-4335-b111-38692785502a/94249860636.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/rujukamexobunitulupawimip.pdfIn PDF document text
    • http://sujawokasafu.onlinewebshop.net/54359402958.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_off0001234b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234B 5252 bytes
SHA-256: d2309eb6194601fc11e81c4894571b50523fc48e5f95d8ddc4e2df522d9d3124
font_01_sfnt_off0001352a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352A 10632 bytes
SHA-256: f7c3f97ab215cf132bbb6d1405fd0614836cc591290aeef016d1370c1cf9a828

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