Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bddea27f92e7ae6…

MALICIOUS

PDF

78.7 KB Created: 2021-09-16 20:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 05d122d4a505c251dfc98b0180084597 SHA-1: 8121f32c862db30fdc5fff150ada0f0a89c9d449 SHA-256: 5bddea27f92e7ae61f2c187d6e76c9524f7d15ecd3f73968eda6f88798377b11
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used as a lure to download further malicious content or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://synerhu.ru/uplcv?utm_term=harry+potter+online+123 PDF link annotation
    • https://praktijk-fix.nl/userfiles/image/file/vovawemive.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/sapipujujikozajudavo.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/24255950788.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/motuwumobamokisejiwiwego.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/wamuxefoj.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/xuvaxozeve.pdfIn PDF document text
    • http://ledins.lv/cms/file/foworewivifinedig.pdfIn PDF document text
    • http://istanbularicilikfestivali.com/upload/ckfinder/files/26584106529.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/perigolofajixa.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/53242854981.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/jokojanagetoz.pdfIn PDF document text
    • http://yulintimber.cn/d/files/19172014652.pdfIn PDF document text
    • https://bczenekar.hu/files/file/24741149505.pdfIn PDF document text
    • http://salkim.com/userfiles/file/vinizolusoz.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/86252684149.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631588129_784622a931.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/zimevobelowefuzoniripunep.pdfIn PDF document text
    • https://mbbs.hr/files/gataj.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613da9390c8de---41612195709.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16139498c6cefa---zigetukawuribijopibazo.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/woxizonezogavi.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://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_off0000d146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD146 10528 bytes
SHA-256: 22a3cd3dd3ccea97b8ec6081fe69aa7913c47bc13e6e3507af4ba5c836d9b7a1
font_01_sfnt_off0000e967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE967 17160 bytes
SHA-256: 73b6b6465b9a643ed9a56fd7b896db22ac4d20235f4a0a6e1c83cd3997e98c24
font_02_sfnt_off0001157d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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