Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9da6ef9246ccbd7…

MALICIOUS

PDF

68.8 KB Created: 2021-09-22 13:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 61f0a90f64d06dc6deea09b10f86781c SHA-1: d1e8c27381b88943defdeef83c70fd1b42020808 SHA-256: c9da6ef9246ccbd721d4c297e0bbe6498a472644ddcbdc981c7edca98e3e8aad
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, likely to obscure malicious activity. The presence of many unknown URLs suggests a broad distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://clinicaveterinariaalbese.eu/userfiles/files/kazaxi.pdf In PDF document text
    • http://baovekhucongnghiep.com/upload/files/lililumusupopegesi.pdfIn PDF document text
    • http://novichiha.ru/pic/file/kebevizamufewalumugewofu.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/raletidep.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/wagipaderawamodeni.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/pikuruw.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/73372949377.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369ea4868f5---sajebupilowadow.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/bitudup.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/tezutekemigod.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/rapafonojuroxipafigebun.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/jomididakebuwili.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144834e19f70---50176084576.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/44328077098.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/92645811541.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/35052092763.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/82441953526.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/35927179247.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/misevukefopuvedudobu.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/pilukapime.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/60366695554.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/mogomemadawufomexapiz.pdfIn PDF document text
    • http://grandfiltr.com/files/file/76924838427.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210912_125910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=siren+season+1+123moviesPDF 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_off0000b048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85F 10608 bytes
SHA-256: 48dfcd3e2eaa9a85649e2decde72bf1d436a8c406cbd51154fdb2a319f7e5457
font_02_sfnt_off0000e0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A4 14984 bytes
SHA-256: 12997fcb1d041d4847e1b22ae936c9354f001ae9e182589b296ef678f08a144c