Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4a4c498478f219…

MALICIOUS

PDF

69.6 KB Created: 2021-09-09 03:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5d3c60e5aa9f1dc9635cc3ddf80cb2fa SHA-1: 596b46a657b5af19daba8fdd6c79cdbf5a85af61 SHA-256: cd4a4c498478f21990a9d90e009b4f0009084c9e9542c1ccd22a229897159e03
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF 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 PDF contains numerous links to disposable domains, suggesting a link farm intended to redirect users. The embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://zgkimsteszew.pl/img/upload/files/7113909854.pdf In PDF document text
    • http://tianlanip.com/filespath/files/20210904182543.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/83869239781.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/32395517278.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/zowesumaletiliromeravijaf.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sakuladosomarawag.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210901082328.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/37481897517.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/dovadexutorexanol.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210901225820.pdfIn PDF document text
    • https://alutat.com/data/file/gotubaxutebobu.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613041fee948b---lidazoxirajapaziko.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/movonevawinumojutan.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/xufij.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/57667750386.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/33795501241.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/rarawageroxusogakonovanu.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cc19c3008---95832286648.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/92906359130.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/96641685801.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/gosapenaraboxivinewumupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+turn+javascript+on+androidPDF 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_off0000b37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8D 14860 bytes
SHA-256: 3f69330e8adc2341338c26863a6c4ddd60d3c13541bb58faa69f964acfb7accd
font_02_sfnt_off0000f03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03F 10700 bytes
SHA-256: 687b09d97a811b0fdfc591bb6a5287ed7bb8650471eb7927f4bbfb31383e3867

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