Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a030135a371e46…

MALICIOUS

PDF

70.8 KB Created: 2021-06-24 07:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfbb496929fc491addc9aac54e6d74ac SHA-1: d59aac4b21c26e1141ff448e7e3184d55e6e0ad2 SHA-256: 99a030135a371e46992ff9589fba203edc587311b6384647ec2851adc51d4b69
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The primary URL, 'https://laborke.ru/wb?keyword=necchi%20supernova%20serial%20number%20lookup', suggests a lure to a search result page. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_LINK_FARM heuristics, along with the ML and ClamAV detections, strongly indicates malicious intent, likely related to phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/wb?keyword=necchi%20supernova%20serial%20number%20lookup
    • https://cdn-cms.f-static.net/uploads/4386349/normal_601855c4b8325.pdf
    • https://static.s123-cdn-static.com/uploads/4403948/normal_5ff265565e930.pdf
    • https://cdn-cms.f-static.net/uploads/4501027/normal_6019ab2ce4432.pdf
    • https://static.s123-cdn-static.com/uploads/4381105/normal_5fc632cb58b9b.pdf
    • https://cdn-cms.f-static.net/uploads/4422658/normal_605f71959ebcf.pdf
    • https://kojoridenifuzav.weebly.com/uploads/1/3/1/4/131406931/62c77af6.pdf
    • https://kinetatosutozi.weebly.com/uploads/1/3/2/7/132740742/buzadof.pdf
    • https://static.s123-cdn-static.com/uploads/4487916/normal_600494b94d676.pdf
    • https://xurufujes.weebly.com/uploads/1/3/4/8/134864067/fuwefe_wubow_kanegikaze_zoxopare.pdf
    • https://xibuderopugef.weebly.com/uploads/1/3/4/0/134042602/7646809.pdf
    • https://fizinulemid.weebly.com/uploads/1/3/5/9/135981283/c36f5bbcd812d84.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60cca19f0de6511b6fe965fa/1624023455415/fisolasodukuza.pdf
    • https://uploads.strikinglycdn.com/files/bf1f4386-d5a1-438c-80fb-2355bb0189c8/38335947666.pdf
    • https://uploads.strikinglycdn.com/files/092de11c-206e-489c-aa9f-c0e206a750d1/sipudozofujetezijigevot.pdf
    • https://static1.squarespace.com/static/60bf6c6a79613f649bb1d090/t/60c8e6f5feb9b96b4df01eba/1623779061506/peyote_plants_location.pdf
    • https://uploads.strikinglycdn.com/files/4fa8eabe-061c-4ad1-b29b-ebcac3456071/significado_del_titulo_de_la_obra_cronica_de_una_muerte_anunciada.pdf
    • https://uploads.strikinglycdn.com/files/ebe5885f-c03f-4c92-8be3-b9291c563220/whats_in_a_breakfast_sausage.pdf
    • https://uploads.strikinglycdn.com/files/afad016d-7269-41a3-9edf-4e127f62ded7/gupudofefupi.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ce32e13838956a5ac8c4bb/1624126178000/oral_approach_and_situational_language_teaching.pdf
    • 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_off0000d8e5.bin
d6152bf2d1dad53c84b5bd7bbeb824e7d807dde8f1a1088c3a6cc85a05772933		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E5 5404 bytes
font_01_sfnt_off0000eb28.bin
ccf8bf05caa3976617e64e150b633984f98e6ec959dec44c18a7a240a54eb618		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB28 10300 bytes

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