Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a8a212434f975f…

MALICIOUS

PDF

86.3 KB Created: 2021-05-22 12:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: fa4f08d22162f0538aebd771f8342963 SHA-1: 23bfe8c9451ac547c9e5c42399dd8d345eb3e4d7 SHA-256: 87a8a212434f975feba6061444de3d85afec04bd51ad5824c0b1936fb0038b88
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to lead the user to a malicious resource, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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=where+did+percy+jackson+go+in+the+lost+hero PDF link annotation
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/sivetivogigurareja.pdfIn PDF document text
    • https://feronodi.weebly.com/uploads/1/3/0/8/130813799/tafubenizejekidofaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407989/normal_606c4331595d2.pdfIn PDF document text
    • https://sevezumu.weebly.com/uploads/1/3/2/7/132710575/magomezutovuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468819/normal_5fed465468212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381340/normal_60637dd89610e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413238/normal_602a027a98bf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469860/normal_6065f2a35cc98.pdfIn PDF document text
    • https://vewufozokan.weebly.com/uploads/1/3/1/0/131071297/2423645.pdfIn PDF document text
    • https://labejewatek.weebly.com/uploads/1/3/5/3/135399287/d070636.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393515/normal_5ffae40cac35d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b538d5a4-94aa-41ab-ba8f-87569fec043e/gelitomiwazomuwabilodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08c34baf-53e9-499d-8c03-98b9eb1090c8/how_long_does_an_electric_scooter_battery_last.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/33627306792.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/green_energy_powerpoint_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e61dc400-d6d5-4fc4-a6dc-a2e783336285/hasta_cuando_se_puede_detectar_un_embarazo.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/87198751420.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/game_tekken_tag_tournament.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d42fbb-7691-4df3-a74e-45e93a53ee89/29017301210.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/lagu_abote_mendem_kangen_versi_jaranan.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/6578872195.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/tupinodurar.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/8764328104.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c3d90b8-9b1e-4a75-b8e0-3b0af6fae3ef/15485605035.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF136 5380 bytes
SHA-256: cfec16f2ee83978c16c9226b50e43dd05f5f45f29da99060627b32442cd90641
font_01_sfnt_off0001038c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038C 10572 bytes
SHA-256: 983eb83702679a7b857db276ff5252790b99a2033d5cb1caee5e095ca024d4bd
font_02_sfnt_off00012793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12793 16208 bytes
SHA-256: fe139538347d724e6b27dab22ead91fbb1eb3470a850438049392072e7f85921
font_03_sfnt_off00013cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD4 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71