Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14346c98e80356c…

MALICIOUS

PDF

79.1 KB Created: 2021-03-21 07:32:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d557edbf45abe67f78c018bfc3091123 SHA-1: 4236ed192c1ea128784bb37f223bbdba4b91f89a SHA-256: c14346c98e80356cfd2fef0d4b766cde09dd72a37a4b34c21736c1533e5edb08
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many of which are hosted on file-sharing or personal domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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
  • 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://botokaw.ru/strik?utm_term=what+is+the+allowable+shear+stress+of+steel
    • https://gikowotezura.weebly.com/uploads/1/3/4/4/134493608/seturevoliweneperuk.pdf
    • https://jowanubeso.weebly.com/uploads/1/3/5/3/135399775/zovivemabodofido.pdf
    • https://rugomekedakore.weebly.com/uploads/1/3/5/3/135302214/7502610.pdf
    • https://niraniki.weebly.com/uploads/1/3/4/6/134662237/finifirizix_ketiridawonibik_gomixisujavuga.pdf
    • https://vuwadano.weebly.com/uploads/1/3/4/3/134350870/losuluxebifamixigika.pdf
    • https://gunajogozezulom.weebly.com/uploads/1/3/5/3/135385825/45dce0188b71a83.pdf
    • https://vigodabazo.weebly.com/uploads/1/3/4/8/134872933/fanutekonox-wolalutofudum-mibolaxivom.pdf
    • https://bitipares.weebly.com/uploads/1/3/1/3/131379103/loxusajokogexobima.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/watajive/bofinuvagekinaxekemurumiw.pdf
    • https://s3.amazonaws.com/gonima/zuvenotan.pdf
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_dcf4449f24f64ac6a0c1a36158ade6bc.pdf?index=true
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_174e851460024cb5ad54ffabe9623e7b.pdf?index=true
    • https://s3.amazonaws.com/tunenijexe/physics_important_formulas_for_neet_2020.pdf
    • https://dc5983eb-04eb-4341-be6e-5f763cf8c8d0.filesusr.com/ugd/979c04_051d74390d62438a931c5a0c85f988b2.pdf?index=true
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_19440a8bfdb042e0974783b6da3bb38a.pdf?index=true
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_244ebb5262a845cc87eea6b565153888.pdf?index=true
    • https://s3.amazonaws.com/xakapudakadu/5380101559.pdf
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_fcb28731ddbc4513838113d41eea6a89.pdf?index=true
    • https://s3.amazonaws.com/vosimalume/magic_mouse_2_scroll_not_working_mac.pdf
    • https://s3.amazonaws.com/tutasujal/zopipununarunusufub.pdf
    • https://s3.amazonaws.com/gumegulaxi/acoustic_guitar_lessons_for_beginners_dvd.pdf
    • https://s3.amazonaws.com/fukepez/bewofok.pdf
    • https://f3e0ee59-b309-4736-aefa-1db4f942b0be.filesusr.com/ugd/e87662_dcd39e3921174ad78b6e1665f8cc32f0.pdf?index=true
    • https://s3.amazonaws.com/fexuror/78950677051.pdf
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_25991d27e5854a7497b40f770c1d6e1b.pdf?index=true
    • 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_off0000f202.bin
2aee54d718189fbe8fae354659d4f0d2480635bb19cf85e4c37b048713e1a961		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF202 5100 bytes
font_01_sfnt_off0001036a.bin
f0597ec41012ee1ff2d57d394f644da63c8b2e980fb9672731aa54d179957e83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1036A 12000 bytes

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