Malicious PDF — malware analysis report

Static analysis result for SHA-256 e12c96d88ab17019…

MALICIOUS

PDF

78.2 KB Created: 2021-09-18 09:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 59982009bc9cbc21a7c4d27f37742d77 SHA-1: b3a26cb686458882c1e0599f189309d179d0635a SHA-256: e12c96d88ab17019ec428f4b87ac463d3841adfd81f2b6c1024356e30534d211
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to unknown or potentially malicious domains, suggesting it functions as a link farm or a distribution point for further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or spread malicious links across many domains.

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 https://makiriaszto.hu/ckfinder/userfiles/files/jewaxanolivawopuw.pdf In PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161366b18978fb---mulexodosubatowixuxik.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/77942445749.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/nafudugutezelef.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/mibabexisew.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/gujugipulamuk.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109051206591990.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/matoselizoluwojetofopi.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/pininonizizosusu.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/39573529188.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/69264589978.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/40277980334.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/fesadezelowusedevib.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/xozukoful.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/89589933005.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/78644680578.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/48609013809.pdfIn PDF document text
    • https://j26clean.com/upload/files/resexikuxobi.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/10219239873.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/65377157087.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/kanakofomivupatogoz.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/xakewatofowurulajokozox.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/63558438163.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/60174808044.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/23562377381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=strength+training+rujuta+diwekar+pdf+free+downloadPDF 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_off0000c9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AC 11092 bytes
SHA-256: 8700d5a26024ae5e9c017aba81505c32745adebdbf5a81b49596266129d665cc
font_01_sfnt_off0000e342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE342 18180 bytes
SHA-256: 25ada7de291d9c313d67ea26f55fd12a0175969c6c9a52995fd67563294eb8b1
font_02_sfnt_off00011257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1