Malicious PDF — malware analysis report

Static analysis result for SHA-256 1635866e9c073399…

MALICIOUS

PDF

134.4 KB Created: 2021-02-23 16:01:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4d3df09d3062de17e73b18aace86605e SHA-1: 38bef8d62e90992f8f014280cd1a289566567fbb SHA-256: 1635866e9c073399d1b1c26f7dd65483878458f738d38eb7b5317906ac2d5765
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to drive traffic to potentially malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, specifically classifying it as a phishing trojan. While no scripts were directly extracted, the embedded URLs are the primary indicators of compromise and the likely vector for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://druttle.ru/wix?keyword=got+deadpool+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471091/normal_5fec83155c742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476593/normal_60269fd732e8a.pdfIn PDF document text
    • https://puxetesotomu.weebly.com/uploads/1/3/0/7/130739839/776636f0fa6879.pdfIn PDF document text
    • https://cdn.sqhk.co/dufelogaruf/bijijPd/37147094277.pdfIn PDF document text
    • http://electriccannoz.club/why_is_indian_peace_commission_important8ywq5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366980/normal_5ffb155da1dbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475997/normal_60328046eb856.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/buponuwebi/good_morning_images_hd_20190.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/sheetz_with_a_car_wash_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/kahoot_auto_answer_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/castellar_font_free_for_mac.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_off0001ca4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA4C 4792 bytes
SHA-256: f6b9c5e66fa9935ea3866539b3719319c505f7eac58fb4081a176a2c946edd55
font_01_sfnt_off0001dab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DAB7 16100 bytes
SHA-256: e2ca93bf99643fa5853fdb198e22b33b8ce83aa00f2b206e6e847bac0a652f2b

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