Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ed2de3ec4f1f41…

MALICIOUS

PDF

78.4 KB Created: 2021-03-12 21:30:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e780053f6e7fce1583c535ef5e1b958 SHA-1: b1ed9a637522d72f69c00d43451b57270e326b78 SHA-256: a8ed2de3ec4f1f41aec91d55c47cff5d266aa87fbfacb47a3c490df1d4906ad7
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'resalured.ru', which is likely a malicious download link. The presence of heuristics indicating a 'download button lure' and 'QR code lure' further supports the phishing and malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://resalured.ru/123?utm_term=danielson+domain+1+lesson+plan+template
    • https://cdn-cms.f-static.net/uploads/4458125/normal_600bd2ba53e6c.pdf
    • https://latapelubatute.weebly.com/uploads/1/3/5/9/135960370/4630627.pdf
    • https://cdn-cms.f-static.net/uploads/4383295/normal_6016e0001007c.pdf
    • https://static.s123-cdn-static.com/uploads/4446275/normal_5fef7a70e5c0e.pdf
    • https://cdn.sqhk.co/jotepomi/GQThhge/poraduxirolaxuleragidutot.pdf
    • https://lafupoboj.weebly.com/uploads/1/3/1/8/131857117/fusepusewo-nulepa-dudusefat.pdf
    • https://lurugidapu.weebly.com/uploads/1/3/4/3/134315770/zatupak.pdf
    • https://cdn.sqhk.co/denugesugumu/YOEOYnI/stan_lee_s_how_to_draw_superheroes.pdf
    • https://juzudibat.weebly.com/uploads/1/3/4/3/134328144/kulawonazexodex-fotukazo.pdf
    • https://cdn.sqhk.co/zugivakizo/jgfvjhu/fitbit_inspire_2_launch_date.pdf
    • https://cdn.sqhk.co/jibetovo/0ihjdBb/wobevetimumiwedamuvibev.pdf
    • https://cdn-cms.f-static.net/uploads/4367640/normal_603076c176ef3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2fdc3272-df64-4fd9-b887-591254f427d4/thomas_calculus_11th_edition_solution_manual_scribd.pdf
    • https://uploads.strikinglycdn.com/files/6ad90465-244b-47d7-a74b-475ba71b2ec9/dominos_garlic_parmesan_white_sauce_ingredients.pdf
    • https://s3.amazonaws.com/wexoteluwag/kdoqi_guidelines_hemodialysis_nutrition.pdf
    • https://uploads.strikinglycdn.com/files/f5c1a62d-96a7-47d0-b99e-f60815a1d95d/sword_art_online_alicization_game_rating.pdf
    • https://uploads.strikinglycdn.com/files/852926f1-3ba1-48cf-844e-3e432606d877/90806218095.pdf
    • https://s3.amazonaws.com/nefagolom/finulogovizoma.pdf
    • https://uploads.strikinglycdn.com/files/5411aeb8-eeea-4d35-a2c9-c28b59e0076e/17704692111.pdf
    • https://uploads.strikinglycdn.com/files/75d19238-c463-4026-93f5-f95332da728d/doxulonuzojo.pdf
    • https://uploads.strikinglycdn.com/files/8d7dadaa-0894-41be-bbbc-0630e594ecbb/how_to_read_architectural_scale_1_2.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_off0000f652.bin
04823ad65456f85ac37af5b9b649e6b84ee111dda7c35d03b02067d963f56122		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF652 5060 bytes
font_01_sfnt_off00010780.bin
9f49bbebcfe81643091fa0edb4301ad2f2ab1bc119da88ac21f3aae3aa6c345d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10780 10800 bytes

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