Malicious PDF — malware analysis report

Static analysis result for SHA-256 f326d9d3084a274a…

MALICIOUS

PDF

79.5 KB Created: 2021-09-10 06:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10131411f03148385fa2f68b685204b2 SHA-1: b4fddc094e7919a332c2a8ff1f769b08d32b3eb0 SHA-256: f326d9d3084a274a87149ccc1195ad48b9442d397518a1fb4ba6d4366eea0f34
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, with one specific URL pointing to a site offering a 'whatsapp online tracker apk'. This suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://infrive.ru/uplcv?utm_term=best+free+whatsapp+online+tracker+apk
    • http://aallergy.friend-match.com/upload/files/98916187587.pdf
    • https://shopinhome.com/ci/userfiles/files/1011841755.pdf
    • https://tuinvandecruys.be/file/97199319060.pdf
    • https://mobilaide.com/upload/editor/file/56910021529.pdf
    • http://texinpack.com/uploadfile/file///2021090708173325.pdf
    • http://cuacuongiare.vn/upload/files/jilagek.pdf
    • https://danfort.lv/userfiles/file/mewur.pdf
    • http://abwcoliseum.com/uploads/files/penamagu.pdf
    • http://geometrarontani.it/userfiles/files/42874699291.pdf
    • https://cincia.ro/ckfinder/userfiles/files/70598143657.pdf
    • http://ciarajewellery.com/editor_upload/file/76665896582.pdf
    • https://ciela13.leaddeehub.com/userfiles/files/50412691010.pdf
    • http://fxlcd.com/upload/file/45833150346.pdf
    • http://anabakorea.jp/userfiles/file/70597593868.pdf
    • http://e-skala.pl/userfiles/file/65729866514.pdf
    • http://www.medicellbank.com/userfiles/files/9331782611.pdf
    • http://location-venise.com/italie_documents/files/zigufatereneja.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/l551gprmopln8u2jg3blh4h506/jifitotitixopogu.pdf
    • https://rux-thai.com/ckfinder/userfiles/files/71485110754.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303cd796af8---47254838091.pdf
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tavojopufix.pdf
    • https://vadihosting.com/calisma2/files/uploads/zamuzatolet.pdf
    • http://opsir.eu/files/file/wopadugosedudusozafidit.pdf
    • http://emanuelarombiarchitetto.eu/userfiles/files/zedamoriwozibirabatude.pdf
    • http://weilandvloeren.nl/fckimages/fofipi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d235.bin
526df81439d63e17327845704315af30787e858845564240a2a447adfff04113
pdf-font-stream PDF embedded font (sfnt) at offset 0xD235 17452 bytes
font_01_sfnt_off0000ff79.bin
4546ad23898dd37f3bd054509446f15b350012a3c95cdd66eb548ec3add0edab
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 10808 bytes
font_02_sfnt_off0001186e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1186E 16792 bytes