Malicious PDF — malware analysis report

Static analysis result for SHA-256 8652b024c0015b40…

MALICIOUS

PDF

80.7 KB Created: 2021-04-17 06:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 059f89cf3a0daa42d6498cc7856324c9 SHA-1: e8316dff3c35c8b13b77d2980138fca89d1cbecd SHA-256: 8652b024c0015b4006867075756cfcbb53720cf0b97ed36fb515c09eb60ceee9
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and employing UTM parameters, which is characteristic of link farms used for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs further supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://resalured.ru/strik?utm_term=long+island+railroad+prices PDF link annotation
    • http://morasuxod.getenjoyment.net/aldi_sd_prospekt_letzte_woche.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498678/normal_60601beccf336.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426832/normal_605d3ec397fb6.pdfIn PDF document text
    • http://lologunaw.mygamesonline.org/79284241481.pdfIn PDF document text
    • http://dadivasim.sportsontheweb.net/zenawotuxisevomedit.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/57214522578.pdfIn PDF document text
    • http://mamefumiwuto.mywebcommunity.org/penggabungan_file_jadi_satu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0645a099-817b-48d9-96b4-e01db0843d18/exerccios_de_qumica_orgnica_resolvidos.pdfIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_3c150113a9804b1389cd5af82e1bf983.pdf?index=trueIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_1dd1501720944875a9bfcec9e6b681b3.pdf?index=trueIn PDF document text
    • http://xefiposokupama.myartsonline.com/61285028291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b3dd963-66c3-40a3-95fc-acb5b466e271/ethical_hacking_books_free_download_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb3eeec4-2cf2-4295-8337-a69af386e45e/fejumoxokajutulinukosewi.pdfIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_df82b4a2d45b48caaeac6bbc71fd0314.pdf?index=trueIn PDF document text
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_58f67a6468f84492968fb5945e575c8f.pdf?index=trueIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_11f37abbad0a45bdbc29d4da49aae718.pdf?index=trueIn PDF document text
    • http://fuwutowamig.myartsonline.com/wefig.pdfIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_17c38dd641a644c9b4b2a36c7323f2c1.pdf?index=trueIn PDF document text
    • http://dijejewilibafux.onlinewebshop.net/68691065307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/156c8c50-36cd-49d1-9e57-30bebabdf9d6/2008_honda_civic_ac_compressor_cost.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_off0000fcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDB 5184 bytes
SHA-256: 08c9c4135c6a625c7fb50d45f686fb821aaa0e97b1b23adec15e63edb02ea95f
font_01_sfnt_off00010e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E95 11596 bytes
SHA-256: f279d5d3ba85ba21fb3540e1a9afffb97ee8711ffa352e5a0b406acd055d9802

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