Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1797e208756838…

MALICIOUS

PDF

100.8 KB Created: 2021-04-02 21:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d107e347d586678ed0e24d3be00874b0 SHA-1: 5aea58c4cca186209219815d44c0e48c41c14e20 SHA-256: 8c1797e2087568380dbec72b073feaf538b1e668782028bb0e40ff75d956ae9b
186 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external URLs, many of which are hosted on disposable domains, indicating a link farm or SEO spamming operation. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing or trojan variant. The presence of numerous external links suggests a potential for redirecting users to malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/123?utm_term=oracle+hyperion+interactive+reporting PDF link annotation
    • http://fazurusitu.getenjoyment.net/nazofuxopazutisej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414175/normal_5fde816f4cff6.pdfIn PDF document text
    • https://dewapapowirise.weebly.com/uploads/1/3/1/4/131438248/073321479a9bfa.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/mind_over_matter_book.pdfIn PDF document text
    • https://xufodikufidu.weebly.com/uploads/1/3/5/3/135382923/popivapik.pdfIn PDF document text
    • https://bekobivovovezu.weebly.com/uploads/1/3/4/6/134608345/4532042.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/f0bf775f4b.pdfIn PDF document text
    • https://nepexinis.weebly.com/uploads/1/3/1/4/131438592/naguzemeweze_gizuwifofeki.pdfIn PDF document text
    • https://xoxekoxezugox.weebly.com/uploads/1/3/0/7/130738790/10f99f18ce0.pdfIn PDF document text
    • http://buvalopexur.mygamesonline.org/how_to_pair_anker_soundcore_life_p2_true_wireless_earbuds.pdfIn PDF document text
    • http://ganedoxumizaj.sportsontheweb.net/broiler_chicken_management.pdfIn PDF document text
    • https://mipikarekegimo.weebly.com/uploads/1/3/1/6/131606279/421702.pdfIn PDF document text
    • https://rekepepijo.weebly.com/uploads/1/3/4/0/134018016/vovujur-wujofesas.pdfIn PDF document text
    • https://zopogunonezaso.weebly.com/uploads/1/3/1/6/131637395/karigaje_siwekivawi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417309/normal_5fcdb972623c8.pdfIn PDF document text
    • https://vuterezupip.weebly.com/uploads/1/3/1/3/131380942/vekoduzadinevulaku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458614/normal_602e444616f6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422137/normal_60377ef53ddd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489035/normal_6015c473f11a5.pdfIn PDF document text
    • https://pibazamigudixo.weebly.com/uploads/1/3/4/0/134000525/5074481a7ca923.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_b2765ab5a64a42e7a6ee498192b86c9f.pdf?index=trueIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_fedda02045ae4cfb99716e95e117f07c.pdf?index=trueIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_5154417e4d3b4df2b00d2805d41b4dd0.pdf?index=trueIn PDF document text
    • http://solarujarinobo.myartsonline.com/letter_practice_worksheets_for_kindergarten.pdfIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_7b7745317e774d5b984afcc6790e5471.pdf?index=trueIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_d64d3ccf91bb40eebde78a91a01fdcc4.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_off00014dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCF 5204 bytes
SHA-256: 1430b9b4a99fe1b6f56676b1c9c8dabbd639d8cf9b35618d843fd50054a0813a
font_01_sfnt_off00015f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F8C 10860 bytes
SHA-256: ac09df6a7e4e2e62859423ce45d358e37d19973632746a5bdc24141acbaaf45e