Malicious PDF — malware analysis report

Static analysis result for SHA-256 d494e338d18a17fc…

MALICIOUS

PDF

68.5 KB Created: 2021-03-28 04:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ffa0d946be79abf65ccfea9986546227 SHA-1: be6b1ee7be004d799c84e935f669092779313ffe SHA-256: d494e338d18a17fc4002c151b71964744c10d09a38ac4f29ae0db53fc674f443
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by heuristics and a machine learning classifier as malicious. ClamAV also detected it as a phishing trojan. The document body, though heavily obfuscated, contains strings that suggest a lure related to video content, likely intended to trick the user into visiting the malicious URL. No scripts were extracted, but the presence of an external URI is a strong indicator of a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://fokemale.ru/123?utm_term=nattamai+1080p+video+songs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4526930/normal_605c965051b06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5fdac6b0d9078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411923/normal_600c1ae715531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370275/normal_6024c7ed6907a.pdfIn PDF document text
    • http://introdom.ru/5954094572288uyb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370092/normal_5fcb5d8c2534f.pdfIn PDF document text
    • http://sputnews.com/motorola_g6_operating_manual653tj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_6058c12749a68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410204/normal_605d9c7a3d34e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391624/normal_6051294e98ef2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406464/normal_5fe63bc1bc53e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454281/normal_6007d8706762a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475219/normal_605aa29558e8a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/97b2c530-e745-4b64-9da8-2316a6c5e737/how_to_mortgage_in_monopoly_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cb93d2b-1b17-47da-b77a-7f681fc74ca8/html_table_tags_list_with_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50a1c032-b57b-4ce6-abd0-697e4cd08193/47193138257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/333a7480-236a-4330-98e0-42d831d4e34e/64210650918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb91d960-eec3-45a9-bfe9-2893f8c6a145/55996991652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f10658f1-d2db-4170-9836-9f02e79305c5/how_do_i_reset_my_fitbit_charge_hr_time.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_off0000ccb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB4 5568 bytes
SHA-256: de64b81366fbe0ae91b46383f32e6bd5413e0c20de3d2bc0944b55c590b2ef62
font_01_sfnt_off0000dfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA9 10436 bytes
SHA-256: 5e321df30f30154f558c50901f3039a4733aee2634fcf91292c952332ef90613

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