Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f220c7acd3704ee…

MALICIOUS

PDF

90.3 KB Created: 2021-10-06 11:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 574f7ddf3ec9c0a6b1a2715d63f80e92 SHA-1: 7c76f5586037a6cf8a7bdad0d38a42e02bc9cca5 SHA-256: 0f220c7acd3704ee612959fdc0324e8145dfbdb685650044042da66cdf627582
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the final destination. Heuristics identify this as a potential phishing or malware distribution vector. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting PDF vulnerabilities or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 5

  • 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.
  • 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://hfbee.tw/upload/ckfinder_temp/files/20210928200112.pdf In PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615c17dc956b0---55598885656.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/45496683131.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/40326628467.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/pukewekibinajovezelun.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109301911478513.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/ligoguduwagerekuwosonuto.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/gekojadenufalopitetiviwe.pdfIn PDF document text
    • https://wineart.online/userfiles/file/vosotomu.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/kimasusagobuwepovele.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b1d8b45c7---kevitovatokamasifodemu.pdfIn PDF document text
    • http://honda-vo.com/upload/file/kotazakulewigaxijilodupem.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/60781025605.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/74777966053.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-02/210902063500679422pc0xoee6bk2t.pdfIn PDF document text
    • https://3visiontech.com/piceditor/file/zopiwavaxigitevit.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/84808037864.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/37479540561.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/xuzixivuxebabow.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/zapivojotexejiju.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/lodirenagadobi.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/vezililugipoxadasewewir.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/60034535301.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/nuzikoroxi.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/96178473755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pharmacy+school+interview+questionsPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E3 19436 bytes
SHA-256: 2fc64ffbaa6fe031536f03039b5f0dd9f2cc6cc0f0469f83c795bb55baae93fd
font_01_sfnt_off00012a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14245 11008 bytes
SHA-256: 7448d4ed7c620d1ad769c594498bf72389280c7fc7bb452d4c6b0c70d40008a1