Malicious PDF — malware analysis report

Static analysis result for SHA-256 384e64e1b8a5174e…

MALICIOUS

PDF

99.3 KB Created: 2021-09-13 13:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 18692519edc908723992fbae9295d428 SHA-1: 924f688c530dd2c156ed0641151ffe9b03ff1477 SHA-256: 384e64e1b8a5174e92fb8a4754abca66fe9058b2c2f937ac42c7fd0a3f6604b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The PDF structure and numerous embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://philabc.ru/uplcv?utm_term=who+made+android+software PDF link annotation
    • http://theponghop.com/upload/files/defonoroxuvetuvelujojaj.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/76658527193.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/538876166.pdfIn PDF document text
    • http://hmed.vn/upload/files/jukonemolosow.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/zosidozolokepaxobivogo.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/53302310259.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/63135787434.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/42993904574.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/bafolopegul.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b41136dd0b---70919253901.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/19679703049.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/66854076563.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/zexuwijarigilewuwuje.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/tilofek.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/8902975750.pdfIn PDF document text
    • https://kokomanis.com/contents/files/78905504884.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/36551431097.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/mafajiduninu.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/21802564900.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/mepamuzumiwefabaxatexavo.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/35671065736.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/5573808527.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/doraferapigarebame.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/naxowe.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16131b25de01ec---64294048559.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/12086633693.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_off0001201d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201D 10652 bytes
SHA-256: 8bb7f820c7026e591fe56239b26335582b08f1f0c042d0244b42cdbfedc781aa
font_01_sfnt_off0001385c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385C 17984 bytes
SHA-256: dbe29318b34cd69653ca93ede1bb5743d6184c275faeb2db1664c7914e109a9f
font_02_sfnt_off00016762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1