Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad412c5ba83dfa79…

MALICIOUS

PDF

79.9 KB Created: 2021-10-07 08:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 69745d64b420b0ec80733673335cc049 SHA-1: 9f4650ff54303e1a59c24ff66363bd64a894e82f SHA-256: ad412c5ba83dfa79533969d172e61a13c73380bca718b50fd709bb0b07811964
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://svezadjecu.me/userfiles/file/98864471589.pdf In PDF document text
    • http://mousike.it/img_ins/files/zuludemorizexujazovixi.pdfIn PDF document text
    • https://heyratacademy.ir/file/temafiwixafa.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/roravonolujisib.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/63996436276.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/5750887688.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/vakilisubakifagiziwik.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/wikodomotimafiw.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/50812875204.pdfIn PDF document text
    • https://songiadahoaian.com/upload/ck/files/58726697759.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149cdb45d340---goridemiwamavutibasamu.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/43884463890.pdfIn PDF document text
    • http://bjjiffy.com/upload/32979809895.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/lifubexodufavebejalapolu.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614db0a79d667---91310009402.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/26813546223.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/genuletebe.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/7024224946.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/sezopedukudasuvumet.pdfIn PDF document text
    • http://tano-cable.com/d/files/32738324196.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/96729029297.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/67108785191.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/5683334203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ielts+listening+buying+a+used+carPDF 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_off0000cf26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE738 19600 bytes
SHA-256: 57e47a23368dbd8fa0ba1edf67724d7850966d7d9d2daf2b5070144945e499df
font_02_sfnt_off000119e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E1 10728 bytes
SHA-256: 265748a5a8739d5e95d4bc9ab499299f472d5664e53d37236d0242f6e22f703c