Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed2b89f7a17edda…

MALICIOUS

PDF

78.4 KB Created: 2021-09-18 05:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6c56ea31146e1476dd810de96d57ea58 SHA-1: 42d4f9375325400dfc3968e93ed9b0643e253843 SHA-256: aed2b89f7a17edda0763860686d2c185708a2e8a6e4940236443b7eb55f7ff34
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://agataklimowska.pl/userfiles/file/sosanopomukafanepo.pdf In PDF document text
    • http://fotocaroli.it/userfiles/files/98062039319.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/1377201107.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/91119065671.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/risul.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/pilukapitijemopekumogo.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/wamolud.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/fokil.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/fobumawusapejupowu.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/96641177255.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/pomofonigekuwe.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/fojunugiwaluvulugokiw.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/44652844871.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/subokomosojanafiduvav.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/vegod.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/vajudizol.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/seruzexazuv.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/nuwowukuresokelatezo.pdfIn PDF document text
    • http://vkts.se/userfiles/file/93117089203.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/talope.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/pamunabuned.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/56099009451.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1630615371.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ve0fp169var4do1b72aq0qobs0/dilodipemoganoluwokotuku.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/pewipolawoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+change+to+3g+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_off0000ce58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE58 10684 bytes
SHA-256: 36309413f3cf9fd0511a077faf9db29bee12cf72f4498c54ad50e635370cc2ad
font_01_sfnt_off0000e6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A1 17068 bytes
SHA-256: 80a41dcc8bd57602fee1d257012a0c6e7d54b28a59e9245c922daf0b37595760
font_02_sfnt_off0001138f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1