Malicious PDF — malware analysis report

Static analysis result for SHA-256 3895e8620760cc58…

MALICIOUS

PDF

77.6 KB Created: 2021-09-17 16:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e7d54a142eae4ef71b518826ed90c70f SHA-1: 060cefff9f204a323d2b86abf9f88e5805117ec1 SHA-256: 3895e8620760cc58d118c9c76042adfa2e081ad83244ce967d187adb1d1a93eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to malicious sites. The presence of external URIs and the link farm structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=set+background+transparent+android PDF link annotation
    • https://ciiinnovationsummit.com/ci/userfiles/files/88821706357.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/80247563681.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/lenanevofe.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/89517191404.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/pupogubomogoso.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/ritabudutabokimejigivobaf.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/setovarazepumom.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/pimadeguz.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/nowexoxupur.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613275bf74638---mazokazezewaxeduberekos.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/luxufonolabepipenuvozaku.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/zofepufumuxajere.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/gonegoratafurisarilam.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/85106313622.pdfIn PDF document text
    • http://tid.vn/upload/files/80023329044.pdfIn PDF document text
    • http://roberthalasz.eu/uploads/file/85202419004.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613036e607488---kenuwevusibe.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/japakuvadovefet.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/79711270851.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/24313902249.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/92828212189.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/33319424778.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/vufedipis.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/sugewopogigobekab.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_off0000c95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95A 17520 bytes
SHA-256: ae9739a4aa866ca007decf7d004dba7bedc3f23e2d2c8fcd1badde48f02a6da3
font_01_sfnt_off0000f702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 11052 bytes
SHA-256: 1563cb60333e02a39011413aec20a31f552d54bf826e13b1cfb712beb1524f9e
font_02_sfnt_off00011074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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