Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2c033362b0bbb9…

MALICIOUS

PDF

71.2 KB Created: 2021-03-23 19:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fa0b8b4cf5ce6e1b3e40d65d106d607d SHA-1: 4b65246b480f185c9e5033c0f5970113c1ae9055 SHA-256: aa2c033362b0bbb914c537073f6900ef941f8e141d0a2b858a10e09c41fb78df
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file, identified as malicious by ClamAV and an ML classifier, contains numerous embedded URLs. Several of these URLs point to disposable hosting and are part of a link farm, suggesting a phishing or SEO spam campaign. The document body, though heavily obfuscated, contains text related to 'Quantifiers worksheet elementary', likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://botokaw.ru/123?utm_term=quantifiers+worksheet+elementary PDF link annotation
    • http://puwofipafemuvif.22web.org/bomberman_2_game.pdfIn PDF document text
    • https://cdn.sqhk.co/sezepemanu/icjgGpl/54652395073.pdfIn PDF document text
    • https://cdn.sqhk.co/fatidizeru/fHigJCj/rainbow_stacker_toy_kmart.pdfIn PDF document text
    • https://cdn.sqhk.co/tobamozusaj/cjfGgel/red_rose_jems_pizzeria_menu.pdfIn PDF document text
    • http://koponegigat.medianewsonline.com/botekanupuzulubilo.pdfIn PDF document text
    • https://cdn.sqhk.co/nepajenine/giGh3gv/harry_potter_hogwarts_3d_puzzle_instructions.pdfIn PDF document text
    • http://potavot.22web.org/37614931554.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzevunoxina/id8jiiQ/curriculum_vitae_format_kenya.pdfIn PDF document text
    • http://bijakolonan.iblogger.org/fun_decimals_worksheets_grade_4.pdfIn PDF document text
    • http://befujukipepejem.mygamesonline.org/bulletin_de_salaire_assistant_maternelle_vierge_2020.pdfIn PDF document text
    • http://zevupixikug.mywebcommunity.org/bivekodizusemal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_0d562513f1c346b798ef12e4b88235e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/80689b15-622d-4b6c-bfeb-e21c9f14b5b9/why_is_it_important_to_follow_rules_and_regulations_in_the_army.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39c4909b-3d11-4f31-b224-c2cb7b97cc64/brother_mfc_j825dw_cd_printer_software.pdfIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_e6bd807c893b4beeaa1f6ba34730da2f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed749de0-d306-4084-a50d-6243c3115c11/rakevujezoxife.pdfIn PDF document text
    • http://najaxobefirag.epizy.com/pimojaganawoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f093fe53-ed6e-460f-b16b-3e76b70ed4f7/what_order_should_i_watch_the_marvel_movies_in_reddit.pdfIn PDF document text
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_7ee8e4a0a7d04c849d1a6c399271fdaa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a61d0221-83cc-4fc0-885f-63516dd16358/how_to_install_stacking_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb5e7775-d389-4dbb-8487-4e5934fc3351/xeruzovuteperiveginigiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60bdea8d-b626-4d8d-8589-a65d3ce056cf/vegiluvilebur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b5372d5-8b4f-4f04-836f-bc1a5e6bb768/rime_of_the_ancient_mariner_what_does_the_albatross_symbolize.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_off0000d9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F5 5328 bytes
SHA-256: 8cfab1ffb52971e6bc778a117f4f1048c7454a91528fb83d9cf76e2200b523cd
font_01_sfnt_off0000ec07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC07 10408 bytes
SHA-256: ee12ca25b6b9711f62e3e92f703595dee054dee56e152d96b97ae9886a700508

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