Malicious PDF — malware analysis report

Static analysis result for SHA-256 a448c16159c48ff4…

MALICIOUS

PDF

76.8 KB Created: 2021-09-16 10:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0caedbc806b38c49955c2a5e2815da6b SHA-1: 7ec035da5bf365d77093b45e481105ec95294c21 SHA-256: a448c16159c48ff457d54285d540e8e90b4b6f6bfa6bf236d0b9b38bd61907b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malicious redirection scheme. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=minecraft+pe+lucky+block+race+map+download PDF link annotation
    • https://eksiliotomotiv.com/upload/ckfinder/files/visexatejoguxoda.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/51020855709.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/82944676591.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/54817431190.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/34808430642.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77948841445.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/nurulaguzega.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/44844223483.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/fegupividagojupogasumed.pdfIn PDF document text
    • http://pedraferro.com/files/files/vekigovux.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140049421839---zonoralor.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/4222381524.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/mowogubugomaj.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/dc21ca302f0fdd7b8f76465c5541e1ae/danojibolimoguluvum.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-9/20210909113604148297.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/lalawuvezidisidakijo.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/255074085.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/dudedirabulalokimunuge.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/xojunita.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/siwatolupawifukaniwire.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/mexadomilexavirizovexud.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1612f521d2ea50---28033633625.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/49098044541.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109130521129652.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_off0000c5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AF 11136 bytes
SHA-256: e350db17370c771cff3de25065df0b87b5aa59c7da6ac924af211f366386d8bc
font_01_sfnt_off0000df83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF83 16872 bytes
SHA-256: 23403e3c86844bfabef836eedd326df606bea10fea66bf57033854800682223f
font_02_sfnt_off00010b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1