Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8dce879a0b821c…

MALICIOUS

PDF

73.6 KB Created: 2021-02-16 18:46:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 448777785e7b1363acb56045c756f268 SHA-1: 6ab39fb7b11b57356d5de6c1e7b54980047d5a3a SHA-256: dd8dce879a0b821ca0f1f4c5c2e2fdda814494b51daed985d835a0e2ce12c246
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The PDF contains a large number of embedded external links, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the presence of numerous URLs and the nature of the heuristics strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://leonvi.ru/123?utm_term=the+data+is+corrupted+8002f957+%25D8%25AD%25D9%2584+%25D9%2585%25D8%25B4%25D9%2583%25D9%2584%25D8%25A9 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4472793/normal_5fce9321c9fac.pdfIn PDF document text
    • https://kodiridit.weebly.com/uploads/1/3/5/3/135342100/luduzapozamaf.pdfIn PDF document text
    • https://vetaguluxidi.weebly.com/uploads/1/3/4/6/134656260/2013895.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451352/normal_5feb2d1d0eb16.pdfIn PDF document text
    • https://kezopepeza.weebly.com/uploads/1/3/4/3/134332650/688465.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457582/normal_5fe6d64971539.pdfIn PDF document text
    • https://tajerupabud.weebly.com/uploads/1/3/1/1/131164315/9221524.pdfIn PDF document text
    • https://sutowuvo.weebly.com/uploads/1/3/4/6/134685384/womukuxof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478946/normal_5fca68b48226f.pdfIn PDF document text
    • http://omerkatanalp.com/dugegobelezujawir7xq.pdfIn PDF document text
    • https://gagegopered.weebly.com/uploads/1/3/4/8/134880179/278c07d0.pdfIn PDF document text
    • https://risimukino.weebly.com/uploads/1/3/1/3/131383953/fed4901b141.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/xubidafefopoduh68je.pdfIn PDF document text
    • http://honbiz.pro/18281271517rlawj.pdfIn PDF document text
    • https://niraniki.weebly.com/uploads/1/3/4/6/134662237/tekude_demig_pezesame_jafamob.pdfIn PDF document text
    • http://shortsomfj.space/auditing_and_assurance_services_an_integrated_approache6smw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375352/normal_6012fa272619e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417315/normal_5ff0e61485a78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366014/normal_60070460a7b4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zajozikudesurek.epizy.com/kodefozuvuziwebalisave.pdfIn PDF document text
    • http://pejinubonuxus.epizy.com/zefagenubed.pdfIn PDF document text
    • http://xopezolesuvobut.rf.gd/lexus_rx_350_for_sale_2016.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56F 5988 bytes
SHA-256: d866c1394ad20bae792089b152804dbf3f17e2333f6145b0e9a8ca5c805f3471
font_01_sfnt_off0000d9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D3 10448 bytes
SHA-256: 09d9ebeed4d5016760c11e7d7d67b74d7f29cf554efcb893b58d5c04d566e276
font_02_sfnt_off0000fdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC4 17028 bytes
SHA-256: ae4b793bbccd73f36f86bd94cba19759f5c77e36029f4a94a2c2c8c4707080ab

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