Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6cad786c0bd8ad…

MALICIOUS

PDF

67.4 KB Created: 2020-11-23 12:59:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8a667fc2128540e2f410ec9bccd5311c SHA-1: 72e817d6ef18acda4495eb69e8655c7b125b3501 SHA-256: 4f6cad786c0bd8ad5a04a23c5818e692f88f24c982542580e91e0fbc13dbc73c
214 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirectors and a link farm, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to educational content ('Spelling words worksheet for grade 4'). The presence of multiple external PDF links further supports the idea of a link farm used for SEO poisoning or distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gettraff.ru/aws?utm_term=spelling+words+worksheet+for+grade+4 In PDF document text
    • https://gokewulifas.weebly.com/uploads/1/3/4/5/134599519/rixiluta-vakovomu-lemalakapadevas-fafidupe.pdfIn PDF document text
    • https://dagojamigim.weebly.com/uploads/1/3/4/7/134763314/6534056.pdfIn PDF document text
    • https://pafetuvuwube.weebly.com/uploads/1/3/4/3/134321561/bazedimomewobopudo.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/e749f5b5-a964-49e4-b764-b790f707edae/85965704074.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/30703748076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a74ba3c-f02e-487c-bab3-a19a932e2800/pigidowugurajowarave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/208ffd60-9c2b-4c48-b182-bd39a6a5d10c/23394002208.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/028276f3-5855-4390-857d-f9693f8081fc/jedikepox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8274fc57-59a5-4b53-b1e2-d3df2974a6ea/matikasuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d530baf-ab2b-4c0b-bad5-912d0b46cf0f/35239305175.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/hindi_typing_in_ms_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfe77f78-884e-45e9-8df8-7d648f4e4ecc/wafefot.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_off0000c89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89A 5652 bytes
SHA-256: abdc027acc7fc38b2c2d82a9b89eca309a835017ea9833f57172855d3d03e438
font_01_sfnt_off0000dbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEA 11012 bytes
SHA-256: f8c849166037468963f41bf5646342b441f42d8bdec5881969668ecce100198a

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