Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d16ea1e89a5b07f…

MALICIOUS

PDF

75.9 KB Created: 2021-09-08 21:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5148ad3751e2fa9fe92c6b3ef7c4d1c5 SHA-1: 94cdb83999a854a751a982830f9a46042200bddb SHA-256: 8d16ea1e89a5b07f3f4abd51a82b324972f51335959ebba37653e4b228b80165
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for distributing malicious content or conducting phishing campaigns. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to obscure the true destination or purpose of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://baocaosuhoatoc.com/luutru/files/dizefelomesilumuzasafigim.pdf In PDF document text
    • https://novahealthclinic.ca/userfiles/file/61638524196.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/42118477823.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/jowunusu.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/widuj.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/zemuxotidewis.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210908025637.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/22984436790.pdfIn PDF document text
    • https://panoramabyty.cz/content/sipajigimugojot.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/kijoresu.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/natojizaxetiwoko.pdfIn PDF document text
    • http://indexone.ru/upload/file/buduxokaporofejekiri.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613675632010a---11876866649.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304f0301ac1---risekor.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/81831481507.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/wadakagunutedaziwida.pdfIn PDF document text
    • http://smogy.ru/files/files/depakejumasilewopuv.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/1619557424.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/nikoralimas.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/34388082918.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090201095410.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/16875962602.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/87259349756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=samsung+a7+2018+disassemblyPDF 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_off0000c037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC037 18280 bytes
SHA-256: cc6c333163b9cc5132914bb7adc842e5888dd18222d232760ca3e4cac8e72fd0
font_01_sfnt_off0000f006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 11256 bytes
SHA-256: 65790a7cf5bfd9b007d34ffb9414d5ac4304e009af688838d9b64403298911bb

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