Malicious PDF — malware analysis report

Static analysis result for SHA-256 af97b6aa198e618b…

MALICIOUS

PDF

69.0 KB Created: 2021-03-16 00:26:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 00f25320adf011c10e98ecabb93d41d9 SHA-1: 2bd5f9a08867576199ad995694205374ab169e81 SHA-256: af97b6aa198e618bdbff651be6bc804c174a7c2aa8525d20214087cb7c017579
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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://gimoguvi.ru/wix?keyword=world+history+modern+times+answers PDF link annotation
    • http://vevujegijozu.iblogger.org/componentes_inorganicos_del_suelo.pdfIn PDF document text
    • http://easterthjg.com/kesodewilavulowaputukkqc5.pdfIn PDF document text
    • http://vuxijagodoku.22web.org/fibupixitosogil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497075/normal_600d80e37bcb2.pdfIn PDF document text
    • http://podarokinsta24.online/59628058251irqya.pdfIn PDF document text
    • http://novedexezenel.66ghz.com/68431628321.pdfIn PDF document text
    • http://1xbets-regs.site/how_to_hustle_and_win_part_2guv23.pdfIn PDF document text
    • http://czecheducation.space/23566510638ud0e3.pdfIn PDF document text
    • http://axecheat7.xyz/malepewugu4m7z1.pdfIn PDF document text
    • http://zitalogeloluwiw.mygamesonline.org/zibuwezesunibuzodateja.pdfIn PDF document text
    • http://infonewsuk.site/automobile_engineering_vijayaraghavangyfp7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460706/normal_5fd117780ca7d.pdfIn PDF document text
    • http://lorozetuwivu.medianewsonline.com/gepowixof.pdfIn PDF document text
    • http://wudebakafepi.mypressonline.com/gravity_falls_journal_3_special_edition_isbn.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/colt_ar_15_9mm_lower_for_sale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473062/normal_5fff753e96bef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373281/normal_5ffae5f4a689c.pdfIn PDF document text
    • http://storezone.info/8790525226gyywu.pdfIn PDF document text
    • http://natezaka.iblogger.org/how_to_see_google_location_history.pdfIn PDF document text
    • http://lazirog.mywebcommunity.org/acurite_rain_sensor_not_working.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_4fa01d97da994446b0b57060b2fc5d73.pdf?index=trueIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_75f94378544f4cca86864bd0196990b4.pdf?index=trueIn PDF document text
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_9520201656d24ea39c525763a364a13d.pdf?index=trueIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_429571880b294e788caa3dd0ac920347.pdf?index=trueIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_6fdd59ca3630490ca89aaed1c2fba772.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_off0000d31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31B 5272 bytes
SHA-256: e85e8de4b5c6dbe45e44c60b781cdb660d37f1c4e8f404d9d919f089d269514d
font_01_sfnt_off0000e4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EE 9780 bytes
SHA-256: 40452d2494819cfed6049f71201e77d8f15e8e536de93ac6958141c3bf1d7391

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