Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b206676f146cd9a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 21:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: eeabd5d6f35adea7da6a488f12289437 SHA-1: 05d6228cf68a4de6443311e67e07dee4bbaf467a SHA-256: 0b206676f146cd9a4013a99c771909b046137ddbae6eb6fbfcf3ba54ddae2fa1
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The primary purpose appears to be directing users to a network of external PDF files, potentially for SEO poisoning or to serve as a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://windsbs.biz/files/file/vixodarumebulamugopud.pdf In PDF document text
    • https://pasarangroup1.com/contents/files/53033084660.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/61363549508.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/89726330594.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/88100980884.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/86547840149.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/9201853897.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/wasozigovi.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/dejulizilefemusewofixilub.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/jivijirinowivujokizeji.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/6757256645.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/lubuvepus.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/73796398227.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/72192283571.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/89388603077.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/lipiriburusegatedaluxog.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/buvaluj.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/70301656987.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/26018640263.pdfIn PDF document text
    • https://conrays.ru/f/data/62892868535.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/58063882014.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/83104508193.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/makoxuragilap.pdfIn PDF document text
    • https://ka-base.no/images_students/files/gunujaxefugoziremajos.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/nivujizena.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090214114915.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/77275661121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+change+the+lock+screen+on+androidPDF 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_off0000e0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF902 18112 bytes
SHA-256: 7658c18c5518d095b1e8d8261295be89d4374aa1efa84dc01499fa21ad6ab599
font_02_sfnt_off000127b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B7 10820 bytes
SHA-256: a6b8e668c1fed2fa22359b87e45219fcc52a07b9e22c6fdf7e3d19ead29675ce