Malicious PDF — malware analysis report

Static analysis result for SHA-256 4471972353eb56a2…

MALICIOUS

PDF

87.1 KB Created: 2021-09-10 13:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: e4e293cd342887c599dc50b439b043c1 SHA-1: e1796c010704ea2db053fc599f26f4f498a92817 SHA-256: 4471972353eb56a236281c00a7020632140a40f0173cda3aa4c74ab63570d55f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://catamma.ru/uplcv?utm_term=watch+this+is+life+lisa+ling+online+free PDF link annotation
    • http://mega-stainlesssteel.com/uploads/image/files/79416862484.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/pokizudoxovozaranom.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/losujuxuterurasolane.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/8336647685.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/43148974885.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/popokuwap.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/gumes.pdfIn PDF document text
    • https://paperland.bg/uploads/file/94438751652.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/fajaliripozumawoxewip.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/rigov.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/tokumexexagivagawiviwofo.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/22760546465.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/11037123698.pdfIn PDF document text
    • http://hueide.com/upload/files/84195626280.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/37279781247.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/57928614414.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/97439166323.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000d615.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD615 17380 bytes
SHA-256: 640098208aee0dae4a4cf5a12ae9f01eeb22ee4c68036a5d116bf48428cacf46
font_01_sfnt_off0000f030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 17844 bytes
SHA-256: 0c4b01a51dfdfe01f82d164613eb54e4bdd19480414caba1dfcbc909adf2536a
font_02_sfnt_off00011e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13669 10608 bytes
SHA-256: 323eac0ab171963f6f3d5f7483e4acc06baa9058ac6ed3f5792be37399c68dc8

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