Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c391e47a7a3879f…

MALICIOUS

PDF

74.0 KB Created: 2021-05-28 03:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 619adc6d0d2411ae72a799e19e193d25 SHA-1: 5f6fe8b9f3b305a72925635d3c13f02dfa756fc3 SHA-256: 2c391e47a7a3879f389991ccf51ec71178bc1c60f8bbfbf031ce2fa15687c58e
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. Heuristics indicate it contains a link farm and social engineering tactics, specifically instructing the user to disable security software and execute commands, consistent with ClickFix attacks. The embedded URLs suggest an attempt to redirect the user to malicious content or download further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://ponafet.ru/strik?utm_term=discord+logo+update
    • https://mosidaxe.weebly.com/uploads/1/3/4/2/134265431/xafogixijaviximugo.pdf
    • https://tepevigiroj.weebly.com/uploads/1/3/4/6/134672536/mubukirubo.pdf
    • https://lawilutimi.weebly.com/uploads/1/3/4/8/134879912/9131998.pdf
    • https://cdn-cms.f-static.net/uploads/4472766/normal_6061de23bb2c2.pdf
    • https://pumebaluzepur.weebly.com/uploads/1/3/5/3/135326980/2209043.pdf
    • https://cdn-cms.f-static.net/uploads/4405902/normal_602b125db85b9.pdf
    • https://medefali.weebly.com/uploads/1/3/4/0/134012737/5983820.pdf
    • https://saselafe.weebly.com/uploads/1/3/4/8/134894966/7683820.pdf
    • https://wibarojadika.weebly.com/uploads/1/3/4/6/134689619/taruwuxagaraxekibome.pdf
    • https://golasirase.weebly.com/uploads/1/3/1/3/131384643/porutogetanazebe.pdf
    • https://static.s123-cdn-static.com/uploads/4414153/normal_5ffb775ea93b8.pdf
    • https://wosodaguv.weebly.com/uploads/1/3/4/5/134590300/3122876.pdf
    • https://cdn-cms.f-static.net/uploads/4528780/normal_5fd8278642372.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9b401e05-faa4-488c-b338-18826b6a1373/surface_area_and_volume_of_prisms_pyramids_cylinders_cones_and_spheres_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/2ef10674-2f41-4847-81dc-4acb9b222fac/62416702047.pdf
    • https://uploads.strikinglycdn.com/files/7fa186cf-3ae7-4408-a729-cefa3582900b/poguz.pdf
    • https://uploads.strikinglycdn.com/files/d0ff3387-29af-415f-98e9-6f8b6163db69/dance_of_the_sugar_plum_fairy_sheet_music_free.pdf
    • https://uploads.strikinglycdn.com/files/383b620f-61af-4a12-baf3-e412b76268ef/651807099.pdf
    • https://uploads.strikinglycdn.com/files/816ea5ef-cc33-466c-8015-b56d1aef6c5d/tabatoguvomizib.pdf
    • https://uploads.strikinglycdn.com/files/85a5159b-3cd7-4430-bfe2-0eace0d9f4b7/jabutiriwimovafixovugajip.pdf
    • https://uploads.strikinglycdn.com/files/ba904813-896f-4d32-a36c-58004d032958/1437114616.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_off0000e457.bin
cc87c83ef9d8fd5dde3a11f726cc93b4e18e17f68752f86ae52cef771456808c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE457 5240 bytes
font_01_sfnt_off0000f63a.bin
da7f13ac716f60e574d2ce619a9f1f1002ab977012521aaf510f8366e166f69c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF63A 10796 bytes

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