Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d1b8e8de651108…

MALICIOUS

PDF

86.4 KB Created: 2021-09-08 17:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 970b5acdc46ee549c656b08849f57254 SHA-1: 88d45d1ba76506dae74567e04b5f3635885fbbbf SHA-256: 67d1b8e8de651108eab6051298b5c76be1f6d6be1a9bdc50fc92f565c6e7f595
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. ClamAV and ML classifiers identify it as malicious, likely a phishing or malware distribution lure. The presence of external URIs and the link farm heuristic suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://dr-onesrl.com/userfiles/files/77704753454.pdf In PDF document text
    • http://boxethai38.com/upload/file/movorivawutusifisif.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210903170710.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/xizebezi.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/18375601661.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/46403560263.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613849865994e---jugejawenawupafiwapum.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210902135010.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/52798440468.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/57714702852.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/jinemogobaboluva.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/50474132942.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/70142722800.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090712194873499.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/nusazokiwevaw.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/vokazaxulopipenosiropat.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/79143125247.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/55029029595.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161332a27d5ffe---17516675928.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/12941951219.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/powanaburekulawiz.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/71163678285.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/48915490735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=probability+worksheet+gcse+higherPDF 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_off0000e52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 10840 bytes
SHA-256: e7f73270f5b74a3e075aff0e1b3ae9597e57d24e8cb2ab8cf73e251008ff7084
font_02_sfnt_off00011685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11685 20908 bytes
SHA-256: 148619af8e6d85dd7b58361083ee289ea4ebd34457649e512408e65971a8b31a

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