Malicious PDF — malware analysis report

Static analysis result for SHA-256 58aab36a7b127232…

MALICIOUS

PDF

75.0 KB Created: 2021-09-12 15:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1a4a1e3d5d14ece854bf38f5a798479d SHA-1: 5a03f149dfff1d6ab66ddc3283635da07a4eeaf0 SHA-256: 58aab36a7b1272321511e8a97d04fc8a0031493ab6b0fd8bb018c29f482a583a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and presented with UTM parameters suggesting a lure for free conversion tools. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the heuristic indicating a link farm on disposable hosting strongly suggest this document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://smidgel.ru/uplcv?utm_term=free+pdf+to+ppt PDF link annotation
    • http://transchem-tech.com/Uploadfiles/files/zosawujumufu.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/lifodumoteg.pdfIn PDF document text
    • http://esistore.com/userfiles/file/xememolevaw.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/vawekutomejanokenaj.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/nujosovawemufokokepujow.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/niketusugoxat.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/30314913504.pdfIn PDF document text
    • https://actorconseil.com/files/file/96534774074.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/mowaveka.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/38945906210.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/kelimurulupofe.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/1850113886.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/xigomobuxo.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/13842948739.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109021617475354.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/lisobawagesu.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/95643907203.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/13943188505.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/fezuginevoni.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/23360876711.pdfIn PDF document text
    • 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_off0000c54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54C 16968 bytes
SHA-256: 1dbea1a120efb2eabf3641ca7f6abf681631fd4110f4ddf35c99ceb147439e64
font_01_sfnt_off0000f122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10938 9896 bytes
SHA-256: 862d936050b85663b9da9c7669b6991278a62290b4ce034afb1fd2e477bad74f

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