Malicious PDF — malware analysis report

Static analysis result for SHA-256 9298d826ec398872…

MALICIOUS

PDF

85.6 KB Created: 2021-09-21 00:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 44ea1efa4d553d0b129ee38c8fc9e7d0 SHA-1: 81b72e7254f7f92d60dcda198d86a6f64a413c7d SHA-256: 9298d826ec398872b41380be073f44b20104ac51d9d7c29e40f7cee92e4c670d
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs point to various domains, many of which appear to be disposable or low-reputation, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and heuristic firings strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://ceccarmaramures.ro/userfiles/file/66296283444.pdf In PDF document text
    • http://delfosventures.com/userfiles/files/xuboxir.pdfIn PDF document text
    • http://tzsunup.com/upload/94891887665.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/dutiwopifokile.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210917_21AAA349F097ADBE.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210919144544.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/29361467696.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/lekekonixevefagivobavazem.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210912032259.pdfIn PDF document text
    • https://techlan.pl/files/file/jagikuzagifesezekal.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/peguzoj.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/15414300807.pdfIn PDF document text
    • http://alkanboya.com/files/file///vujemisaxelapibaderu.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/40003351147.pdfIn PDF document text
    • http://africareview.in/userfiles/file/pafaxafitotemopexawulexem.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/44380875589.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/84540194716.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/88387630799.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/fiwunesoremiz.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/31446692122.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/fejabiveridovuket.pdfIn PDF document text
    • http://abc-tel.ru/data/File/pusujovelediwu.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091319224983.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/77c4ae3d4ce70d4cb7648fd99827a605/xedatodazi.pdfIn PDF document text
    • https://codecs.ro/images/file/takikulitoga.pdfIn PDF document text
    • http://tano-cable.com/d/files/patexegiditexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=dnd+ref+sheetPDF 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_off0000ebf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10408 18016 bytes
SHA-256: e856f7fddc23a0605e785148ad0591460c0003d0f3f9b3078aded195602105ae
font_02_sfnt_off000132d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D6 10032 bytes
SHA-256: 951188bece045b0e617cfd61236358e77425cbf21c17004e6ace213d37336fd5