Malicious PDF — malware analysis report

Static analysis result for SHA-256 298e5eb453b4f8d8…

MALICIOUS

PDF

68.7 KB Created: 2021-09-24 21:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0ee436da1a62ad8965c755598162e829 SHA-1: dfd9fb6d70a250cf2f027affed6d6a3b5e1e8b92 SHA-256: 298e5eb453b4f8d8d6635ec3a591f20b3f35cebe4b950f2181b85b3d194aff37
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable domains, many of which are hosted on what appear to be compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute malware or phishing content. While no scripts were directly extracted, the overall structure and the presence of external URIs point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ncfc.com.tr/ckfinder/userfiles/files/dudizubetelazajasotewes.pdf In PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/kuxoxemapajaxakukevozo.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/kedawur.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/4955028678.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/71102484794.pdfIn PDF document text
    • http://thaoduoconline.com/userfiles/image/file/16626523986.pdfIn PDF document text
    • https://senhewood.com/d/files/pijido.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/47561475663.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/mopivoxiwozovad.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/xogositomifimavozo.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/87848612344.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/82361641617.pdfIn PDF document text
    • http://18554080.com/userfiles/file/97105854729.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/bonobebabigategukonuzalo.pdfIn PDF document text
    • https://insp.biz/img/file/89239874799.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/gebagafogiriguladuref.pdfIn PDF document text
    • https://computerzone.pk/file/ruwutirajubewoveberu.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/zesidawifetipuxamibivu.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/nibodadubiba.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091416483173499.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/najef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=vita+app+download+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_off0000ad0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD0D 10132 bytes
SHA-256: 29674236e3331c1ed25c1d9b10cf291984cfb565b2be78d9024d9feb6affbbba
font_01_sfnt_off0000c3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C9 16536 bytes
SHA-256: 1d0da51020e6fdaf9cec646f197bc7e49e6a15ebd803b1ea74d09a399799ca2d
font_02_sfnt_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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