Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59d083dc506e2e9…

MALICIOUS

PDF

81.8 KB Created: 2021-03-20 15:20:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59894e47c3bc1a8324d7b54019ffcde1 SHA-1: 74dd676ff6962fa869fd3da40863681175759ab6 SHA-256: c59d083dc506e2e97d0d34934de5468b8338bb340c35b72565e8b89454e34fc9
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, a technique often used for SEO manipulation or to direct users to malicious sites. 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 URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://zajinet.ru/strik?utm_term=what+are+5+dap+teaching+strategies
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/d8f291e12054ba.pdf
    • https://xomarexisu.weebly.com/uploads/1/3/4/7/134701616/nafivemo_bilosiw.pdf
    • https://jujijivefovagev.weebly.com/uploads/1/3/4/5/134508679/vitagobe.pdf
    • http://superheatbelt.xyz/palosuwojurutpw851.pdf
    • https://watuluvijigu.weebly.com/uploads/1/3/3/9/133997483/1664062.pdf
    • http://bitcoinchat.fun/how_to_write_a_research_proposal_introductioni1oa6.pdf
    • https://tesudegijalel.weebly.com/uploads/1/3/1/4/131438759/ef342a4d.pdf
    • http://idealicait.website/gofezafaratetibunivixh3xsl.pdf
    • http://tk-pobeda.site/58601444080ot401.pdf
    • https://xixinuwomisit.weebly.com/uploads/1/3/1/4/131437484/0fbb4c2d43bc.pdf
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/tojafavufezan.pdf
    • http://osthondroz.com/pumominefunekaxw4rfb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/lefemijip/xevoromalakadafejuj.pdf
    • https://uploads.strikinglycdn.com/files/48077412-1a4d-4e16-a24e-0a7d259da38c/do_i_need_an_eye_exam_to_renew_my_license_ny.pdf
    • https://uploads.strikinglycdn.com/files/c3edb99f-a94b-4915-8fc8-a34dc4325226/msi_970a_g46_dual_channel.pdf
    • https://uploads.strikinglycdn.com/files/ec6b2b0c-2df2-4f12-8458-e78ae69ec216/portrait_drawing_artists_in_chennai.pdf
    • https://uploads.strikinglycdn.com/files/ccbd47d1-c884-4617-88a4-3e7bf6a5fdab/nikon_p223_4-12x40_review.pdf
    • https://uploads.strikinglycdn.com/files/95e9900e-3399-43b7-a557-43e8b85ae254/suwewizavudur.pdf
    • https://uploads.strikinglycdn.com/files/68f0121e-2f00-4dfa-b3b5-733a08f3abf0/vebotunales.pdf
    • https://uploads.strikinglycdn.com/files/9fb6fd49-88bd-4c67-87b3-461bd8c5363b/wozumemebawagagusilozem.pdf
    • https://uploads.strikinglycdn.com/files/c83bae69-f1a7-492d-9811-bb280dee2ae2/advanced_dungeons_and_dragons_2nd_edition.pdf
    • https://s3.amazonaws.com/pegozegi/spider_man_3_game_for_psp.pdf
    • https://s3.amazonaws.com/zijivevip/how_to_do_exercises_with_resistance_bands.pdf
    • https://s3.amazonaws.com/nafoxuda/25109347529.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4f4.bin
c957139c65e362ff7c0b98f90cc29b799a517008363738c3cb709ea930c7c250		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F4 5120 bytes
font_01_sfnt_off00010663.bin
a744b17af9665e4da20ae4ce2ad83a400bf84355999f5915884c101f29647452		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10663 10432 bytes
font_02_sfnt_off000129f8.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129F8 4324 bytes

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