Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0571921c7f5df9…

MALICIOUS

PDF

70.1 KB Created: 2021-04-03 13:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3fd19776ac4b79c49f96cb2ce25e16e SHA-1: 93bfa4e6db13d565fdf16e949e784894b3932ba2 SHA-256: aa0571921c7f5df97782c41677586c47d2cb61299e34fde848fe7c43ecab51e7
96 Risk Score

Malware Insights

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

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 a suspicious domain, likely intended to host a malicious payload or phishing page. The document body, though heavily obfuscated, suggests a lure related to 'Lipoprotein cholesterol pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/award?keyword=lipoprotein+cholesterol+pdf
    • https://cdn.sqhk.co/borefigux/6gfGbjb/iphone_11_emergency_alerts_not_working.pdf
    • http://zitosuganenat.medianewsonline.com/self_taught_programmer_book.pdf
    • https://cdn.sqhk.co/neseleko/3Ejgkih/fodujitusikemilasa.pdf
    • http://libopadu.scienceontheweb.net/menifazetomoropu.pdf
    • https://xafadatez.weebly.com/uploads/1/3/4/4/134478609/posasalupifus_gokere_telos.pdf
    • http://fanuvazav.scienceontheweb.net/animals_coloring.pdf
    • https://cdn.sqhk.co/siripeka/icZLmgi/history_channel_schedule_oak_island.pdf
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/9b37454e.pdf
    • https://minazunanuvisim.weebly.com/uploads/1/3/4/6/134666394/3492b953be62.pdf
    • https://cdn.sqhk.co/lajakukilo/e2AWhii/fanuboloxekapekebesab.pdf
    • https://xivovawa.weebly.com/uploads/1/3/4/8/134875493/3731213.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kedisijusa.onlinewebshop.net/67567231158.pdf
    • https://s3.amazonaws.com/tuzakifezara/alchemy_training_guide_vanilla_wow.pdf
    • http://pabotojixupi.atwebpages.com/89698925395.pdf
    • https://uploads.strikinglycdn.com/files/badf20c5-8e02-4164-aef6-838defdab5ae/kidogaxafidawob.pdf
    • https://793776f3-68b4-44d3-947a-596ce2c6f652.filesusr.com/ugd/4e977a_91536456b6ca4b8296f34b4718b9e029.pdf?index=true
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_55a71837df1d4d32bf41a2470a654fee.pdf?index=true
    • https://s3.amazonaws.com/bopuxosavubare/bujokokipapawuvuxiz.pdf
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_1e519c1d19a042e79e9a28e18cf56115.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5de222a0-1e2f-4947-a193-887b7b7941b8/93310658469.pdf
    • https://uploads.strikinglycdn.com/files/9ecc8a28-e869-4df7-b5ea-ab34356bb216/lg_v10_battery_draining_very_fast.pdf
    • https://uploads.strikinglycdn.com/files/56f3e819-e86f-40a9-a3d6-bf24f8c7ddf4/dragon_ball_z_tenkaichi_mod_ppsspp.pdf
    • https://uploads.strikinglycdn.com/files/2b0d097c-2405-4e44-b58d-488f503f2b80/tilopuxagez.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_off0000d7a3.bin
d4237be75977a8dc7a881899012390a7e66261bf44f96291a1acf1e2691b5c6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A3 4976 bytes
font_01_sfnt_off0000e892.bin
aba277dadeef320bafaac73b8f793b89462d43a91d2b3f0eb53514e62bf459a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE892 10104 bytes

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