Malicious PDF — malware analysis report

Static analysis result for SHA-256 c910aaab8bfeafbd…

MALICIOUS

PDF

63.9 KB Created: 2020-12-23 20:42:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a15a3adf2befd9921b3bf5eb493e48dd SHA-1: fa135a038128f820023b28f493e08d60583cebbd SHA-256: c910aaab8bfeafbd127fe06bd2128b6fa25c52b96a06d46bfe18bd5f15baddad
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document body, though partially corrupted, contains text suggesting a lure related to 'answer math problems online'. An external URI, https://traffnew.ru/aws?utm_term=answer+math+problems+online, was extracted, likely serving as a malicious link to further compromise the user. No scripts were extracted, but the overall structure and detection signatures point towards a phishing or trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://traffnew.ru/aws?utm_term=answer+math+problems+online PDF link annotation
    • https://bivapere.weebly.com/uploads/1/3/4/6/134689139/rafumufulos.pdfIn PDF document text
    • https://rijizego.weebly.com/uploads/1/3/0/7/130776487/83282a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528915/normal_5fc258db92874.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483337/normal_5fc2ae45e7991.pdfIn PDF document text
    • https://gamajebijapam.weebly.com/uploads/1/3/1/8/131856653/jixejaxuso-xupobir-kumijesodepepe.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/ba208395-2f4c-4613-aaf0-ad3cf045bf40/20255856660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/909ce4fa-5336-429f-a6e6-ed7b9ed76731/38832800949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb4d255a-f5c1-4ad5-af5b-83203e708d6d/46246872056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b281f849-36ab-4a00-b3e1-139a1c15e974/68875559107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66fe5507-48fd-4995-8759-5ea2b498d875/jijelotiwivinil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A5 2960 bytes
SHA-256: d8ef148c594adba1946aa7d95f188f3f33f69c77bc22762a1a4a57bcfd89a796
font_01_sfnt_off0000be27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE27 5280 bytes
SHA-256: e8c8ec52cdb5b721134ffa1d3d6d9903cf31e8961bd666e02ef2e0587cd04a0e
font_02_sfnt_off0000cff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF9 10280 bytes
SHA-256: a7d16d106bdeea12821401b406ccd9303d3395b7c611ff86705f84e3427854cc