Malicious PDF — malware analysis report

Static analysis result for SHA-256 77117c79d1e80eb5…

MALICIOUS

PDF

75.5 KB Created: 2021-04-16 07:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7470a56f78a57ff5ef3f15615c51ff5d SHA-1: d2c1ad3b95106f9bf76c7ac138c2f1e43b509788 SHA-256: 77117c79d1e80eb55c56d16af28af3eeef898ba64ce0199d9e4b3a2745686d10
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 dynamically generated or appear to be part of a link farm, suggesting a malicious intent to direct users to potentially harmful sites. The ClamAV detection and ML classifier strongly indicate malicious content, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=the+wife%2527s+lament+sparknotes
    • http://kizisuruz.22web.org/wunosenabavugemalivu.pdf
    • https://cdn-cms.f-static.net/uploads/4500444/normal_5fdbfc0c5640e.pdf
    • http://zufonirawanowo.iblogger.org/kunodulijavopumiweb.pdf
    • https://cdn-cms.f-static.net/uploads/4465691/normal_604cbe5664fcc.pdf
    • https://cdn-cms.f-static.net/uploads/4450160/normal_5fe93af0a2201.pdf
    • https://cdn-cms.f-static.net/uploads/4416316/normal_60307a638817d.pdf
    • http://kumorafeg.iblogger.org/gijup.pdf
    • https://cdn-cms.f-static.net/uploads/4372987/normal_606e6d5da1738.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_fc942ba5ca864807a6328e84067579db.pdf?index=true
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_d9b2602ed3404f08bc86b2dbc50e2299.pdf?index=true
    • https://49d0234c-aae4-472d-9cb9-6192e9e03354.filesusr.com/ugd/a63595_683b2baa1ec74bc7b7df55460a5f6aa6.pdf?index=true
    • https://6346cca1-8be9-442e-91e0-e35201572fa6.filesusr.com/ugd/a8c077_e3c854d2cc2a49c4ae7679c5b6cbf407.pdf?index=true
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_da8f0470e60f42f2b6f97434c37e67c0.pdf?index=true
    • https://s3.amazonaws.com/wupuxus/red_haired_woman_orhan_pamuk_quotes.pdf
    • https://s3.amazonaws.com/faluzotixupi/cambridge_colleges_guide.pdf
    • http://sedaweguwuguxu.rf.gd/52309716091.pdf
    • https://eb22cd64-ba88-4d74-9269-d2b8937e52af.filesusr.com/ugd/3b217d_72cfefeae61645f1822092730d358870.pdf?index=true
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_22d31720f5d944468f51b094afa1ac38.pdf?index=true
    • https://f3874c2d-c116-49c2-b7b6-9300dc8fc43e.filesusr.com/ugd/b11f6d_72a47ca6ccbc4dda9c810f17b9c7c313.pdf?index=true
    • https://s3.amazonaws.com/mekonulegipero/64377318235.pdf
    • http://wanabovemuzume.rf.gd/64712243184.pdf
    • https://s3.amazonaws.com/pubopelej/12360275398.pdf
    • https://s3.amazonaws.com/jedobufudajewu/36878445611.pdf
    • https://300a1258-3b13-45f7-80b9-bd8966f45320.filesusr.com/ugd/81888a_3746d70aaa6b46fca3e9369c757a4444.pdf?index=true
    • http://mopawupebele.rf.gd/marvel_universe_vs_the_punisher.pdf
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_5786145182574f408f27429ae2939916.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea9a.bin
e4c0339c577d72924d97c291a57e2c0e28e085d5bebf41e8adc7511db2e72079		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9A 5280 bytes
font_01_sfnt_off0000fc7c.bin
0c0c0d5d36b364b7e6e29731b0e38741c66c17c6603132470a96717a2d6938c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7C 10492 bytes

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