Malicious PDF — malware analysis report

Static analysis result for SHA-256 cccae4f3bf315ab9…

MALICIOUS

PDF

77.7 KB Created: 2021-07-13 19:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d6dc847ae982398019ae4fd47379a404 SHA-1: e2b2ebb91d8d9f885a651062395bd3b6443abe9b SHA-256: cccae4f3bf315ab983170005ebbe8fda1cd39b2d9ef8fbab5e6e0d37684c2339
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. A heuristic identified an image lure linking to an SEO redirector, which points to the URL https://drafthe.ru/square?utm_term=conserving+the+british+bitterns+reading+answers. This suggests the document is designed to trick users into visiting a malicious site, consistent with phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9001

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://drafthe.ru/square?utm_term=conserving+the+british+bitterns+reading+answers PDF link annotation
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8ebc10cbdad4d35037dca/1625877442089/74650943091.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8cac8b825900159c290a1/1625869001002/23594954990.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8f89b5fa2eb14b909ff3b/1625880731420/66029813733.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec95e11951226b8b8c6ef5/1626117601746/how_to_get_buff_without_working_out.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e9627bdc37083541baacd4/1625907835257/web_services_interview_questions_for_5_years_experience.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4B 10804 bytes
SHA-256: 186532c592690af96c60007bd16ad84cf9f060e9dbf2a2c0853afdc97cd16a75
font_01_sfnt_off0000e809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE809 16440 bytes
SHA-256: 0350df2331694eec0aaa81742348b521631d35c2d06fa4684e619c9527c0cabf
font_02_sfnt_off000112a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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