Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa118f839d51971…

MALICIOUS

PDF

68.5 KB Created: 2021-04-02 17:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 41128bf336f989182af279d3308acd1a SHA-1: 45d079b34c2424ec81da9906f80b546e742bf0e6 SHA-256: 9fa118f839d519716ac38527285e676d0de5d85e033d1ce16652c8ed85c1c1cb
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URL 'https://leonvi.ru/strik?utm_term=how+to+upload+a+document+to+wix' and the link farm URL 'https://joninotabuxid.weebly.com/uploads/1/3/5/3/135387421/4a91dc042a890.pdf' are key indicators of the potential destinations.

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://leonvi.ru/strik?utm_term=how+to+upload+a+document+to+wix PDF link annotation
    • https://joninotabuxid.weebly.com/uploads/1/3/5/3/135387421/4a91dc042a890.pdfIn PDF document text
    • https://wowavimisaken.weebly.com/uploads/1/3/0/8/130814021/xodanojesabarob.pdfIn PDF document text
    • https://busajivajikiguv.weebly.com/uploads/1/3/1/3/131384407/besavogagiwoze-varoluwun.pdfIn PDF document text
    • https://cdn.sqhk.co/vabedesi/hjPJjdT/foxwing_awning_with_change_room.pdfIn PDF document text
    • https://vixikubinimagap.weebly.com/uploads/1/3/3/9/133997110/dopenevosunuti-zipen-ritixe-wisezudas.pdfIn PDF document text
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/toruderajen_wadesedeganete_lebomesate_dijufajar.pdfIn PDF document text
    • http://gusozeragukete.iblogger.org/zuwiretafolanepoxum.pdfIn PDF document text
    • https://valazasabo.weebly.com/uploads/1/3/1/3/131398294/9fcd97b976ab.pdfIn PDF document text
    • https://cdn.sqhk.co/mivijigonof/B0jc0jj/freakiest_love_songs.pdfIn PDF document text
    • https://poximixej.weebly.com/uploads/1/3/0/7/130776069/7851524.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kuboki/49841558221.pdfIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_5fefad458a604c68b445f658c65ead38.pdf?index=trueIn PDF document text
    • http://sixerukiboreta.epizy.com/cuphead_all_bosses_guide.pdfIn PDF document text
    • http://vobununebufipu.rf.gd/78346696069.pdfIn PDF document text
    • http://diveruwafulebes.epizy.com/html_template_free_bootstrap.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/anime_tv_apk_free.pdfIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_304aceb2a00a401098b00c4c229337c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nisoxow/factoring_polynomials_puzzle.pdfIn PDF document text
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_fe9d9315e3114a2d825959c1bd4d71e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/is_delirium_movie_scary.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/legox.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F9 5068 bytes
SHA-256: a49f7faafb8881e1f957d2e86b1df292c430750b31b26b8b4d7018ecf8081473
font_01_sfnt_off0000e23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23C 10068 bytes
SHA-256: c3ab4c182c12cbd851aa94d263171ff7ce55cd648f5a1727329880123553ce41