Malicious PDF — malware analysis report

Static analysis result for SHA-256 1852e0cf07259413…

MALICIOUS

PDF

74.4 KB Created: 2021-04-04 18:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30305b54ec21b55e1daa4eb1acb16b48 SHA-1: 22efc377db8ba8975fbd038e81bab302ed95394c SHA-256: 1852e0cf07259413a728e29d52923665470379b85dc358c12326336dbdd160fd
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 point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=brydge+bluetooth+keyboard+for+10.5+ipad+pro
    • https://jevomijaled.weebly.com/uploads/1/3/1/8/131856338/2699263.pdf
    • https://goxupoxujebab.weebly.com/uploads/1/3/4/8/134892745/e2f3a82.pdf
    • https://sulomotosepotu.weebly.com/uploads/1/3/4/7/134744650/fejaterizeke-zutaver.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4b0c331e-9f5c-44a2-8293-336dc83c69bd/molovixojaremoratabubesej.pdf
    • https://uploads.strikinglycdn.com/files/c7125949-4498-4c54-b0c6-f6bb52065d37/adapter_design_pattern_real_time_example_in_java.pdf
    • https://dfdccaec-9019-42eb-ab8c-14eed22d5f88.filesusr.com/ugd/2e00cc_afb1a2c1f8ee4ac0970d36536c30c71a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3b921f9d-7b6c-442b-a7ff-0e9ac221ec53/38253088489.pdf
    • https://s3.amazonaws.com/bisazabe/dvd_electoral_dysfunction_answers.pdf
    • https://uploads.strikinglycdn.com/files/01bb3de6-a09a-4c9e-939f-6683eb82f704/oldest_picture_of_a_king.pdf
    • https://s3.amazonaws.com/silubebebefuju/nezexopefo.pdf
    • https://uploads.strikinglycdn.com/files/bcb3fe8a-e3b6-4a32-94c1-b841eb14c958/tajuwabetawobopifi.pdf
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_862023c8fc484afe93bdbe3971122518.pdf?index=true
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_d17a66017ef441aeb16288c9a5d7fe93.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cc8169fc-1008-4ee3-ade0-fe94d551e91e/stock_market_hours_on_thanksgiving.pdf
    • https://uploads.strikinglycdn.com/files/385e72ae-aa44-4135-a9ad-3d03fa9ca9b1/flir_tg165-x_canada.pdf
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_06ede0b292c843c787dd94ad3556c2db.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_off0000e084.bin
42462f9eaab2276596d85cab37344d740b436e64f3c461aa0ebbb59d467803d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE084 5828 bytes
font_01_sfnt_off0000f470.bin
81470e410335bb4693bc21c6c570980fdbad64bcdb9be339ba3c30e7303963f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF470 11196 bytes

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