Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81e69252cfbb076…

MALICIOUS

PDF

71.8 KB Created: 2021-04-04 19:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5b54774433d93481b4e9b7b521141362 SHA-1: b036f32db44c74e70553ca3f02a6618d1a2efff8 SHA-256: e81e69252cfbb076a30c666d47010653cfc56af527a203416a45ed7d70fc9821
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=springfield+local+schools+new+middletown+ohio PDF link annotation
    • http://risiwivozival.iblogger.org/java_1._7_for_redhat_linux.pdfIn PDF document text
    • https://tavasosezirom.weebly.com/uploads/1/3/4/7/134768566/58a8b7a5379.pdfIn PDF document text
    • https://jokuvaput.weebly.com/uploads/1/3/4/5/134589987/8530006.pdfIn PDF document text
    • https://sapezirotup.weebly.com/uploads/1/3/4/5/134576964/219fe9d.pdfIn PDF document text
    • https://fababeporutow.weebly.com/uploads/1/3/1/3/131381804/5788270.pdfIn PDF document text
    • http://pefujogori.iblogger.org/26422304111.pdfIn PDF document text
    • https://sazunanul.weebly.com/uploads/1/3/4/4/134488017/bevakogigelur.pdfIn PDF document text
    • https://lapomuxonadaxo.weebly.com/uploads/1/3/4/5/134584049/zixokonavusemevegav.pdfIn PDF document text
    • https://pufoviram.weebly.com/uploads/1/3/4/5/134580195/142ac8f64e89.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_71f672b83a824cdf86e1e125800e4aee.pdf?index=trueIn PDF document text
    • http://vaboponom.rf.gd/bepidi.pdfIn PDF document text
    • http://merererunovud.rf.gd/sociology_notes_upsc.pdfIn PDF document text
    • http://jovuxajir.rf.gd/najaxoximeremudezemuto.pdfIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_92d2af5244e34411b2d13384ed20c056.pdf?index=trueIn PDF document text
    • https://19a4122d-28db-4ec2-a9e3-8c1e87f24dd5.filesusr.com/ugd/70d0b7_d549d0e10e53405e94d91d26af811dae.pdf?index=trueIn PDF document text
    • https://6b9ff03a-ef48-417a-a14c-919df0f903d0.filesusr.com/ugd/f459ea_d1dd6a60b0894c128faad6300333349c.pdf?index=trueIn PDF document text
    • https://c5c1e25b-3ca9-4f8f-aecb-0ee3b29cb37b.filesusr.com/ugd/f4fe7b_9c32b5a3518b48e09ad44c58f7963add.pdf?index=trueIn PDF document text
    • http://sefibonep.rf.gd/how_to_get_rid_of_a_pimple_without_popping_it.pdfIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_af7bab960ef148c1b585317fa7526fdf.pdf?index=trueIn PDF document text
    • https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_3ebd783b49b148d6b71d9377a2936df5.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40D 5764 bytes
SHA-256: 65bfa3b402b4dfcdc27bc29fb58363568ee4836331f7bb620c14e59771f7f118
font_01_sfnt_off0000e79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79E 11856 bytes
SHA-256: fb18d6fc817f08420e2695a51188d365aafe012485434d469b1be5486ce02da6