Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3f7b7a822a54c8…

MALICIOUS

PDF

83.3 KB Created: 2021-01-14 20:15:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 105a8976fa6a77c360760a25cf283c2d SHA-1: b755466ce42ea336fd36463c219eca15754f2f03 SHA-256: 1f3f7b7a822a54c8cb36346b051d967ebefbb15447f6a651100944bc4a8a5f9b
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ggtraff.ru'. This, combined with a high ML classifier score and ClamAV detection as 'Pdf.Phishing.Trojan', strongly indicates a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure for a 'free PDF download'. No scripts were extracted, but the presence of a malicious 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://ggtraff.ru/123?utm_term=mosaicos+6th+edition+pdf+free In PDF document text
    • https://site-1168207.mozfiles.com/files/1168207/26894554645.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369309/normal_5fb89c31dd391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_5f8b3e9388366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390081/normal_5fc21e346175d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445879/normal_5ffe25a7165e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372383/normal_5fde139ccb138.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374536/normal_5fee3f336a325.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413978/normal_5fc90ac230eb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417675/normal_5ff846538ac7f.pdfIn PDF document text
    • https://site-1172776.mozfiles.com/files/1172776/zeliji.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/ekrhgym/sharpening_a_fillet_knife_with_a_stone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5f8cfdbb32ea4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374537/normal_5fff579dc23b3.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/xelimewat/crystal_reports_totext_too_many_arguments.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_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 5368 bytes
SHA-256: 24b978d89a947c21df82ae00ce0662142d2fd5b09a8235b3d90ad6d7583dc83f
font_01_sfnt_off00011a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A62 11448 bytes
SHA-256: b00c23b3fa81e9216ff021b4ce109318c097ea871b11c117030696dbbcb705c4

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