Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5e7f3721780ddb…

MALICIOUS

PDF

69.7 KB Created: 2021-10-05 02:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b3fb26309034ff8bd3284e01d0a718be SHA-1: 2cd3fd7833084c40b2cda41a90f18db234247f47 SHA-256: fb5e7f3721780ddb2c9ea2e05bb6d4c7680956564007fec8ecd744d1adb8c526
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to disposable domains, flagged as a link farm. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the structure and numerous external links suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://beauty214.com/uploads/files/202109270931228960.pdf In PDF document text
    • http://pappteam.hu/userfiles/file/zenoxelegowezowuwixi.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/bumijoxuko.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/toa9tcsvpa1glp92qeos8r6aoa/godufarobokogosuzu.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/74570214322.pdfIn PDF document text
    • http://geose.ru/userfiles/file/2461280576.pdfIn PDF document text
    • http://anninh247.info/upload/files/21578031927.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6a0b9913927db50f775822cbec2a87a4/wivabodonokip.pdfIn PDF document text
    • http://teraval.cz/res/file/73813440297.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/44432031920.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/33710854994.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/89651124172.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/25980760053.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/18805844555.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/84448239751.pdfIn PDF document text
    • https://christschoolblr.in/userfiles/file/piwejuwepi.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/zelojo.pdfIn PDF document text
    • http://beiks.info/public/file/78136079717.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/8334529331.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/53358083755.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/40902161311.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/59444196125.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/1194821069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+set+photo+as+background+on+powerpointPDF 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_off0000b1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A8 15044 bytes
SHA-256: 0b478dab6e1ebad47b5e897a3ae69ee1c8a154324ed01f4dddbbd1fadc0c4ef9
font_01_sfnt_off0000d79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79E 11156 bytes
SHA-256: 70d9f064e61ce1d18abe4ef388a325903ff108b938e97421b8a11fb81c4c5c14
font_02_sfnt_off0000f147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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