Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfc73d5e4cd942b…

MALICIOUS

PDF

96.4 KB Created: 2021-09-16 16:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c35109f25d325a466c4e0b59b2831a6c SHA-1: 2d22c99572c2ca25282d0b9ce3cb57348d83346b SHA-256: 0bfc73d5e4cd942bd2828d7e2a8721c57379931fe0bb3dbe8ea5373c76128c3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://oniceh.ru/uplcv?utm_term=xiaomi+redmi+8a+custom+rom PDF link annotation
    • https://bestcaps99.com/ckfinder/userfiles/files/xoxirat.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/rotizu.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/57884594302.pdfIn PDF document text
    • https://ocw.tw/uploads/files/36776168031.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/29082187916.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/dofujitemazulivaba.pdfIn PDF document text
    • https://go2germany.ru/files/file/43251369140.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/zivukus.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/50443004267.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139028126e00---41050069734.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/kesezilolapunuli.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/90925454397.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/78232463848.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/17010190974.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/vazilujojarubowavu.pdfIn PDF document text
    • http://gardatrans.com/content/Files/vavitufamejijezim.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/4c8808674621bdb45fa58d38fb819c59/36645727752.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/misojimo.pdfIn PDF document text
    • https://argumentua.com/i/file/lidemewupakibogopox.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/35274900188.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/8919110430.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/buxabekajirexadezativodo.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BC 25592 bytes
SHA-256: b744303478e1f7ff7b0652243eadacf10a8e74aaa14bc22fdf27472d9620f1f2
font_01_sfnt_off000121bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BB 2304 bytes
SHA-256: f14d84e98824a801f2aebb1308d46a90fa44947251157bcbd647a20ac1c990c6
font_02_sfnt_off00012bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001440a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440A 10696 bytes
SHA-256: 70c67f44af351b9074a93a96c292ddc9985f1f582f51b8bb932d4b82be78e81d
font_04_sfnt_off00015c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C9C 16320 bytes
SHA-256: e59a6cc32d04a7cacf5e921f93d593b43628e7473256f987049ae3dc7b35c891