Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d76c5757d9c59f…

MALICIOUS

PDF

73.4 KB Created: 2021-03-27 21:01:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1129c619d237d8f477e9d2e7fb448aac SHA-1: d07933f7e9a93d56ab836f5eeef0fe71bd4291d4 SHA-256: 50d76c5757d9c59f0a98284b6e1c3b8b2a4f241d699899de2fccde7e1a705676
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The presence of external URIs and a visual download button lure suggests an attempt to trick the user into downloading a secondary malicious file. The embedded URL points to a suspicious domain, likely serving the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/award?keyword=upsc+calendar+2020+21+pdf+download
    • https://cdn.sqhk.co/tezizejaropu/1Bjaghi/80292122013.pdf
    • https://cdn.sqhk.co/rigizisojix/icicjaf/stack_it_up_liam_payne_lyrics_espanol.pdf
    • http://wekeb.space/tone_it_up_cinnamon_roll_protein_muffinsk8pna.pdf
    • https://static.s123-cdn-static.com/uploads/4374520/normal_5fe5467576614.pdf
    • https://cdn.sqhk.co/puvubuzu/gghhh1a/dolafopigidibepax.pdf
    • https://cdn.sqhk.co/fikalibumi/hexgfgc/ludafesobefuwofasesigesub.pdf
    • https://cdn.sqhk.co/taxodisilif/g8IEG8K/50366236072.pdf
    • https://cdn.sqhk.co/tewisifupib/mM42co8/49231111246.pdf
    • https://static.s123-cdn-static.com/uploads/4379231/normal_5fe2a5f3894d6.pdf
    • https://cdn.sqhk.co/zoraxiraga/jghLMje/clocks_easy_piano_sheet_music_free.pdf
    • http://mivetys.xyz/150802291109e6sv.pdf
    • https://cdn.sqhk.co/libegavezu/Op12ege/chargepoint_sbe_merger_date.pdf
    • https://cdn.sqhk.co/mamevugixej/d2GhdPN/legoravovobalosulufubopa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3455f87f-cf6e-46e4-8b0f-11ca1a26d35a/10537567354.pdf
    • https://uploads.strikinglycdn.com/files/a13aef04-a621-42a2-8b50-ddc78c0d4acc/lipuneveziweledipavuxoba.pdf
    • https://uploads.strikinglycdn.com/files/6c2bfa39-124c-4778-90eb-7a0e5bf9d727/last_of_the_mohicans_book_age_rating.pdf
    • https://uploads.strikinglycdn.com/files/11554353-c628-4cea-b21b-b2a3cde376b5/csci-ua_2_introduction_to_computer_programming_syllabus.pdf
    • https://uploads.strikinglycdn.com/files/86c2af2a-4eab-47c7-8920-29b68d9d5906/how_to_get_a_drivers_permit_in_ms.pdf
    • https://uploads.strikinglycdn.com/files/7cad1700-4944-462f-98fc-cf38e5bdc2ed/the_mysteries_of_udolpho.pdf
    • https://uploads.strikinglycdn.com/files/bf48c718-9128-4c1e-b495-89bc14337f39/36944422502.pdf
    • https://uploads.strikinglycdn.com/files/8a16be67-7b11-41bf-a9f6-d745c85bfb6c/classical_guitar_christmas_music.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_off0000e261.bin
fac8208e5d3f07f3fdead635fe5ad1c25a5c5826307f58e4642e0acd39f092cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 5560 bytes
font_01_sfnt_off0000f574.bin
c48350dc4b757280c146b1840f5c7cb6cff5b906d5ccaddfa7cd92172ff45551		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF574 10244 bytes

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