Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ecd9bcf6dbeb0d…

MALICIOUS

PDF

77.7 KB Created: 2021-09-25 09:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4e7c27d068f75c5410c85be514a857aa SHA-1: 545b257121f5609d66b042c380126effae76611b SHA-256: a2ecd9bcf6dbeb0d232c9bd7d7e633f0ec7f058f803690220dd30d4aa5bc80ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or redirection scheme. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this. No scripts were extracted, but the overall structure and URL distribution point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://yuanhebiotech.com/upload/files/jumuzib.pdf In PDF document text
    • http://klenderbio.com/upload/files/22255324420.pdfIn PDF document text
    • http://sbcnepal.com/images/file/jereboderumadazo.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/lafigiti.pdfIn PDF document text
    • http://ahknchem.com/upload/files/64745929422.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/92543608652.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/23147530006.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/gekagobumubo.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/92398940324.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/6f1df83828fb6c408bf7a09de33d80cf/38260984608.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d3955e346a---49818296262.pdfIn PDF document text
    • http://boldogelet.hu/media/27924289344.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/dazexivaxutuvenatofo.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/68091455502.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/96802828332.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/loxid.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109221408238713.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/damaxaduvujikoximit.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210915_3A7DF48251DFB7C4.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/vibit.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/5071612538.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/52778847330.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/27478013943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=windows+10+pro+2004+iso+download+64+bitPDF 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_off0000c110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD927 11012 bytes
SHA-256: 37b69a4e872a7c5b7bcb723b97a9179830fa215d347efdb8f4e97ca210fe10b7
font_02_sfnt_off0000f2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 20144 bytes
SHA-256: ec8dccf2dc2e557ee8c3b7d934db1fce568a250a1d419d401fd9796a2afcdb51

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