Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c8daa367ceab11…

MALICIOUS

PDF

81.6 KB Created: 2021-09-14 08:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b485bde6b78ef4495820079dd51ce36 SHA-1: b5ebf86b2be5261d291959bede464af0cc769cb1 SHA-256: 81c8daa367ceab115130cefebe983dd4d53fc00f8962b9d315c2b48345ee27af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting an attempt to obscure malicious destinations. While no scripts were extracted, the presence of many unknown URLs points towards a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://autoradiator.mn/uploads/ckfinder/files/84983535170.pdf In PDF document text
    • http://onlinetradeshow.ir/uploads/files/kikobukovefilatudegew.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/73420389996.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/36226112723.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/bopujej.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/7432775929.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/92676236350.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/talejivurudobuxebax.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/botufibabidabugobupuli.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jobawubuxenazukusumeno.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/nakipamatubatakokumowiju.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/30192323895.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/fegenebonu.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/gagup.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/fenetegivimevisenak.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/4c94234e23fd6606697ae2959d75c000/gafufidinumuwavozu.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/zumil.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/sepobojobazuwogomisura.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/81893752565.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/petubi.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/rigowopijexudujis.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/kanumozubejunevemusuvi.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/26589073199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=sherlock+holmes+book+read+onlinePDF 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_off0000da22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA22 17608 bytes
SHA-256: a3f0cfe61452bf09c72fce00e58ca5e1d40600deca121be7c16f8e65440ccb2d
font_01_sfnt_off000107df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF6 10844 bytes
SHA-256: 0009affcdb6f8449d6042b7cd43dfe2c0e06453d8d32f5f32bdf32a8f74726c9

Open this report in the interactive analyzer, or submit your own file for analysis.