Malicious PDF — malware analysis report

Static analysis result for SHA-256 0634423ad67c0c5c…

MALICIOUS

PDF

93.4 KB Created: 2021-04-04 17:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4fd8f67e6e2583b29b066790aa4406a SHA-1: 2153ed3c3169a9446ed4d766effe058c725423cd SHA-256: 0634423ad67c0c5c0c9d9f56f036b0ff1bca684f480966e2343d15347f920e24
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

This PDF document was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. Notably, it includes a 'Clipboard command execution lure', instructing the user to copy and paste content into a shell, which is a common technique for executing malicious commands or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://jumiwimov.ru/award?keyword=atlassian+bitbucket+tutorial+pdf
    • https://wumaluruporemad.weebly.com/uploads/1/3/0/9/130969386/8365074.pdf
    • https://gofegupozomo.weebly.com/uploads/1/3/4/4/134479888/19fc899d.pdf
    • https://wofovado.weebly.com/uploads/1/3/1/8/131871653/7f43f19d.pdf
    • http://zuzorovix.scienceontheweb.net/wufizuweveto.pdf
    • http://lalashoppen.online/how_did_the_industrial_revolution_affect_the_following_world_economy_productionnhps9.pdf
    • http://axecheat6.xyz/rollercoaster_dash_rush_and_jump_the_trains45yw3.pdf
    • https://loboweron.weebly.com/uploads/1/3/2/6/132681880/05b1b.pdf
    • https://zaximasuxudaris.weebly.com/uploads/1/3/4/5/134590642/9965740.pdf
    • http://dektesheff.xyz/bd_result_hsc_marksheet_2019vu0d2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://12c9c681-cafc-4f88-93da-cb6f471fd49a.filesusr.com/ugd/f09a9d_28fbc369a9a340a8addf93e8bd4141c1.pdf?index=true
    • https://s3.amazonaws.com/bisazabe/netflix_offline_en_op_laptop.pdf
    • http://fidegaf.atwebpages.com/vuteterinubob.pdf
    • https://s3.amazonaws.com/timituvupame/19727003733.pdf
    • https://s3.amazonaws.com/zufaxepixiguxax/way_down_hadestown_sheet_music.pdf
    • https://s3.amazonaws.com/jeromisixinolib/dungeon_masters_guide_5e_download.pdf
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_e6fa6dc16a684832be729d411eb2cd0d.pdf?index=true
    • https://s3.amazonaws.com/xupizewuxere/sebiteke.pdf
    • http://wozimape.onlinewebshop.net/difference_between_aerobic_and_anaerobic_bacteria.pdf
    • https://s3.amazonaws.com/jumedemimo/42934258499.pdf
    • https://s3.amazonaws.com/jemisajoda/railcraft_rolling_machine_not_working.pdf
    • https://s3.amazonaws.com/zalisujezajaje/kaxifitidegizurefakeboke.pdf
    • https://a6f18165-9bfd-46c9-8f51-0ab50cd0b687.filesusr.com/ugd/265c7a_938bf8e836584e6fbf821c7cb004fad7.pdf?index=true
    • http://xenexafa.myartsonline.com/satetutezi.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_off00012de8.bin
12b9ec80c2ff0a685d2b7363c97ea26b2838a64b0f42b7270371de09208ee87a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE8 5344 bytes
font_01_sfnt_off0001401f.bin
5f5db688bb143855054be803d9183d0bb23725f63d6748731744ebff912f2c8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1401F 11820 bytes

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