Malicious PDF — malware analysis report

Static analysis result for SHA-256 4992d6af4d592fa5…

MALICIOUS

PDF

82.7 KB Created: 2021-03-29 21:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 78686d78b9c39f742d37ffa0807ad6f7 SHA-1: 558fec3f18ac90bdd71e2554630ee0ef849da7db SHA-256: 4992d6af4d592fa5f6fee9cc97aed2f1706439f9f18f071a91d44e9c2a5afed8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • 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 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://dafemum.ru/wix?keyword=borax+slime+lab+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403824/normal_60028a4821045.pdfIn PDF document text
    • http://com-connexion.xyz/zavilukibutisugowiysb1l.pdfIn PDF document text
    • http://tinubawolu.mywebcommunity.org/biological_molecules_worksheet_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/kixarozikej/CiaidiA/personal_shopper_jobs_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/sicnIha/vidutunawal.pdfIn PDF document text
    • http://afracheat6.xyz/407920578233nevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461250/normal_60196d2ec69c0.pdfIn PDF document text
    • https://cdn.sqhk.co/xarupozikala/ibhflKC/tewajok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380681/normal_5fdb0a04812a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406202/normal_5fed9d149043b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382781/normal_6011de87d49f4.pdfIn PDF document text
    • http://natiral.space/transport_tycoon_2_free_downloadawlwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403408/normal_5fe9936c82953.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498994/normal_6044d5b438bdd.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/ijfPAjc/44758608653.pdfIn PDF document text
    • https://cdn.sqhk.co/pasezateda/ij3iAkg/my_talking_ginger_2_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/rorefevobo/sjaibgd/filter_sort_in_r.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/n4chfmw/14635237663.pdfIn PDF document text
    • http://legko.travel/50223797101yid20.pdfIn PDF document text
    • https://cdn.sqhk.co/musamari/hhqggbO/22138964484.pdfIn PDF document text
    • http://registrat.space/ti_ba_2_plus_professional_manualpwz6z.pdfIn PDF document text
    • https://cdn.sqhk.co/goduwonon/zicgeig/graphic_designer_starting_salary_2020.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/trigonometry_angle_formula_table.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446642/normal_604b3854c2fdc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kilarosine.atwebpages.com/navy_chief_eval_closing_statements.pdfIn PDF document text
    • http://nununad.myartsonline.com/fighting_boy_meets_girl.pdfIn PDF document text
    • http://dovunufesesiz.onlinewebshop.net/husqvarna_235_chain_file_size.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_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 5340 bytes
SHA-256: cb0f3d24d7ae0ef8194eac0b0e2d4e8e3ab410851868b476aada22476758ba1f
font_01_sfnt_off000114b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B8 11328 bytes
SHA-256: 88d1504c1599e35e5bc67a18c4256168f0d7f601ac4c1a2031538d297a96bca4

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