Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afa33112bc1c365…

MALICIOUS

PDF

84.0 KB Created: 2021-09-19 08:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3305543956104a4134ade7a966f6459 SHA-1: 2d2baeea48fd680f1f1c6f3d685bbd9f474398fa SHA-256: 3afa33112bc1c36540607182b02260274e642f404a486b90e5ff7f5b10f8fa16
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://smidgel.ru/uplcv?utm_term=android+mtu+setting PDF link annotation
    • http://stefanourso.com/public/userfiles/file/xunululurabeguxetoxepu.pdfIn PDF document text
    • https://trainova.com/userfiles/file/visopojalanevizupelodatok.pdfIn PDF document text
    • http://skia22.ru/pic/file/tebimu.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210907042728.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/38772372473.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/voxanidazawugizutevu.pdfIn PDF document text
    • http://storemisr.com/uploads/files/34054504850.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/suriz.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/xutidifuledewop.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/zaluxezologuraxedut.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/wawugixuxavajomek.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/goxotowisikizepa.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/43514064808.pdfIn PDF document text
    • http://cochemical.com/upload/files/94320131529.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/naburo.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/96796918295.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/37952457346.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/66084884008.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/gimugelojezowezam.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/dobejefobapojisufukifaf.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/71209701950.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/degabotewedafizibubob.pdfIn PDF document text
    • 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_off0000e1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BC 18920 bytes
SHA-256: bce865c3587c95ffa5a5ba45784efa4927b53178a4fb1501756c2a48ee92ebba
font_02_sfnt_off00012b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0B 10464 bytes
SHA-256: 6fd4fff8ae89c5255191312fa764eb202ce38aeb137a2ffafbd6eba632c6bb9b

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