Malicious PDF — malware analysis report

Static analysis result for SHA-256 1effd96dfb2754ed…

MALICIOUS

PDF

59.6 KB Created: 2020-12-21 14:38:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15063cfac6d811fc006f985c75a2ca24 SHA-1: d8aac9f3cd4435d8e679da123de151189bf35f8b SHA-256: 1effd96dfb2754ed3846c907264b7ee8026fc86eaf593014ca38e751072a6fa8
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The embedded content, though heavily obfuscated, appears to be a lure related to "To kill a mockingbird chapter 27 questions and answers", suggesting a phishing or social engineering attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect the user to a phishing site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/123?utm_term=to+kill+a+mockingbird+chapter+27+questions+and+answers
    • https://cdn-cms.f-static.net/uploads/4375894/normal_5fa3879faeb85.pdf
    • https://cdn-cms.f-static.net/uploads/4387243/normal_5fd161197f891.pdf
    • https://zizuralozirufu.weebly.com/uploads/1/3/1/4/131483034/rokufuluzibugot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zafaronivaj/pupivitijev.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd18269eac5d50e568dba2/1606228006962/el_rancho_stockton.pdf
    • https://s3.amazonaws.com/kubafezin/lol_guide_morgana_support.pdf
    • https://s3.amazonaws.com/tetazino/asymptote_worksheet.pdf
    • https://s3.amazonaws.com/babuxufarizuxur/55533242949.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_off0000ae16.bin
7df4483e4673954e221e06798309b7c52d93756742c4d4d5fffd6cb1f785a1c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE16 6072 bytes
font_01_sfnt_off0000c29f.bin
2ea8451753d214728581af473fac8476b5d735e38c1e830208ce3875fa5817ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC29F 9100 bytes

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