Malicious PDF — malware analysis report

Static analysis result for SHA-256 855796f3162f3377…

MALICIOUS

PDF

74.9 KB Created: 2021-01-05 19:59:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6cf46b1beba24f5cbad315a9d69cb3d9 SHA-1: 77e5002e8b45cbf43fd715850bea5d1a07d6c8d6 SHA-256: 855796f3162f337728c2c831f851ae29d87476c5613ca9374a438c5ea9703e45
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, traffking.ru, which is a strong indicator of malicious intent. The ML classifier also flagged this PDF with a very high probability. The document body, though heavily obfuscated, appears to be a lure related to 'Annales school of history pdf', suggesting a phishing or social engineering pretext. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffking.ru/aws?utm_term=annales+school+of+history+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4500447/normal_5ff08af851754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445892/normal_5f9fd0a80de4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381318/normal_5f9446ebc1587.pdfIn PDF document text
    • https://nokojuponamipi.weebly.com/uploads/1/3/4/8/134891784/54c79f33.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/kipiluxen-fabumusumolu-zujuw-gafuk.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/kShbggl/maxisys_ms908s_pro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452382/normal_5fedfc068ee7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460694/normal_5fc37ee181728.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/ritoma/runebezuwup.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/mivubejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf9ade2-8061-43f8-a2f3-65359212bc23/jewels_temple_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tekujel/xesasimixizetazezaso.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_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 5336 bytes
SHA-256: 23fc2f9edabcdc2b2c51f948c502530e5adc3e740bd417fa07665c1f2eac413e
font_01_sfnt_off0000fba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 10232 bytes
SHA-256: 0c6744ada4e026ddac5fc18e94aade0581376327a587c3687c5af0339b1e02b5

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