Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ead4c2bce961612…

MALICIOUS

PDF

73.5 KB Created: 2021-01-03 02:51:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 899f21d24f956d07f2d656b304c96ca1 SHA-1: 1a7f2df0e66fc2fbcf36a7c6539efc34fcf5e78a SHA-256: 2ead4c2bce961612ef09ae3db47480d558de693e18ed1e180811fa7a49e4a708
182 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic and ClamAV detection. The presence of a QR code lure and a visual download button suggests a phishing or social engineering attempt to trick the user into visiting the malicious URL. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffmen.ru/aws?utm_term=whatsapp+apps++2018+apk
    • https://cdn-cms.f-static.net/uploads/4426550/normal_5fbb05cf720e4.pdf
    • https://cdn-cms.f-static.net/uploads/4445557/normal_5fb8a2067f4ac.pdf
    • https://cdn.sqhk.co/kupemopo/fjbhijj/guess_the_movie_emoji_quiz_diva_answers.pdf
    • https://cdn-cms.f-static.net/uploads/4451210/normal_5fb9f850c9d01.pdf
    • https://cdn-cms.f-static.net/uploads/4389366/normal_5fbb42259ca93.pdf
    • https://cdn-cms.f-static.net/uploads/4384155/normal_5f908f3481e6e.pdf
    • https://cdn-cms.f-static.net/uploads/4462727/normal_5fc29c55df7f0.pdf
    • https://cdn-cms.f-static.net/uploads/4370528/normal_5f91783fcd8b4.pdf
    • https://cdn-cms.f-static.net/uploads/4371495/normal_5f9158c43fef9.pdf
    • https://cdn-cms.f-static.net/uploads/4481055/normal_5fe875933f4a4.pdf
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f8e379382fc1.pdf
    • https://cdn.sqhk.co/sijiposago/ibfie0P/zerixasoxeduwekap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/eee7f97b-17f1-4f90-b045-7eefa375a0a7/25812771878.pdf
    • https://s3.amazonaws.com/nuvukivaxiren/gevuvaxuxozofusu.pdf
    • https://uploads.strikinglycdn.com/files/42dbbebe-41f2-493c-bc47-0bf9061ceb5b/icassp_2020_acceptance_rate.pdf
    • https://s3.amazonaws.com/pajukovuxetu/69222548024.pdf
    • https://s3.amazonaws.com/pasawe/anganwadi_online_form_bihar_2018.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_off0000e0c0.bin
3f793d20a371b93a097fbdffa42caeb2ec7cacd2be934d4624ac82f927bf2755		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C0 5376 bytes
font_01_sfnt_off0000f317.bin
dcb4f79f0c800fc39f86308245b914c106c2fc9ee4712af8eadbbbd0d454d327		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF317 11288 bytes

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