Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fac806f016fde88…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 04:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 346299561bf239df71d3db9d1d3c5cac SHA-1: 8ac0f13c8ec50c8f5f788f512e02996fe095ba69 SHA-256: 3fac806f016fde883b6e85012a12e0da02404eb86251a240be7fa8828f9c43f3
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, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to PDF files hosted on various domains, suggesting a link farm or distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/84771715006.pdf In PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/46674953133.pdfIn PDF document text
    • http://rem-proekt.com/f/file/dokozas.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/31368863733.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/lifuxosot.pdfIn PDF document text
    • https://nyig.com/files/file/gulitatoleposino.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/metutugerunixukakefuxavo.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/65337028038.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/xezosefumijevipifuvelaw.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/73253915062.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/4625551482.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/45643946820.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/xefedivup.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/47984661611.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/roruvijajigini.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/komupa.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/lawolinatodefagev.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362cb368461---mujasozogidiwotoxosuju.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/78971733508.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/tuwikagapirivig.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135358c20a00---xesuvuzobapesoferem.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/55966060228.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/pejugefuxigeninonini.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/61417442307.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/firunarimixi.pdfIn PDF document text
    • http://htwy.com/upload/file/27363731636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=teddy+tamil+full+movie+onlinePDF 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_off0000db43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB43 17272 bytes
SHA-256: d899fb3c9bf89ae963b4131d3f2b6f18df548154174ffc249531eae96d91298d
font_01_sfnt_off00010767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10767 10492 bytes
SHA-256: 30a1b8012ec082a550007d38503281e43cb99fe1045cd9f1ae0a7dd9f50d222b
font_02_sfnt_off00011f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1