Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e12a75e690e15d…

MALICIOUS

PDF

68.6 KB Created: 2021-09-17 17:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c4b4ed7f68daae602394737001534a6 SHA-1: 2dd5ab58d5c077922884e43d25c6fc992a2ee107 SHA-256: c0e12a75e690e15dbc92a90a0edcf44edb4552288cf992695b11f8a439400465
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. One URL specifically mentions 'download hello neighbour apk', suggesting a lure for users seeking game downloads. The ML classifier also flagged this PDF as malicious with a high probability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 4

  • 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 http://barudan.hk/UploadFile/file/20210906091014150.pdf In PDF document text
    • http://uhy-th.com/image/upload/files/zanugabuzuvusisa.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaaa48c7fd---rebugobid.pdfIn PDF document text
    • http://ping-property.com/user_img/files/78872713232.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/34184080104.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/60842070677.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/lafok.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/28134947184.pdfIn PDF document text
    • https://brs.jo/userfiles/files/3441892138.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/92744534290.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/72045208724.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/89817287017.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/zagevuminizepuvatesofa.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210906212333.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/zatalegegoxa.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/kevuni.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/mikag.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/88690890226.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/timisusug.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373b4eb5c51---97249495640.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/87491129878.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/bemaxabexad.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/tozefezutekuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=download+hello+neighbour+apkPDF 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_off0000ae24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC636 15396 bytes
SHA-256: 7985802fe03f10ae204bab04f3d2a8af88c4896130510ae84ce2b545d2fcf9a8
font_02_sfnt_off0000ecf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 10824 bytes
SHA-256: 97e1890e76e12eb04f1c1f4c03d7f62545d33d02429ed5560db08c7254d69f82

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