Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a624ecf22bbe614…

MALICIOUS

PDF

75.8 KB Created: 2021-09-25 09:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 64d268a820371f9c90e3999f0255686b SHA-1: 6aa9a1d84ddbbb50052136c4671e273938b6988f SHA-256: 7a624ecf22bbe6146d9902d20485733141d0f512c4fc26efb5ebe3c8cbfea00a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan-like behavior. The presence of numerous external links, many pointing to disposable domains, suggests a link farm designed to obscure the ultimate destination or to host further malicious content. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://esejsc.com/upload/files/95594204072.pdf In PDF document text
    • http://newcityhk.com/userfiles/28181959988.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/89755747874.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/reguz.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/vibasilijutavatumaxi.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/28377795994.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/40218486823.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/biwikogixesamudididowefi.pdfIn PDF document text
    • http://fittbikese.hu/files/file/38626219058.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/boxebefajuxefemur.pdfIn PDF document text
    • https://duel.pl/userfiles/file/dujamoriwoge.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/3859a11d81a4eb5836551f9cc53169b1/76548358804.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/15823766771.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/79465423779.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/699421b19281b1b10540e4eb1f87fa3d/39359541525.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/012122302216.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/95562284690.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/52292892487.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/43302749856.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/94965974495.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/1970858955.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/zusimamaw.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/33366331865.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/gidipajin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=philosopher+ai+apkPDF 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_off0000c085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC085 19216 bytes
SHA-256: bb9e12ce57f51c5cb192461d98d5d5ad13202508b8d569a183f8b05f6a23f277
font_01_sfnt_off0000f2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC1 10240 bytes
SHA-256: 232fca6d4d43dffcc3846cbfa96106a03e36d5cad1281350933b7e6dd35dde9e

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