Malicious PDF — malware analysis report

Static analysis result for SHA-256 44662856dbda129c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 01:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 96653c6b498048740c4605789ca25beb SHA-1: 624a05e4edee831f038148994762d28696c6a6a1 SHA-256: 44662856dbda129c66de92b5798ca9de84495b4cc4de90bf175895f5aa4cbd37
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to numerous external PDF files, with one URL containing 'utm_term_redirector=True'. This suggests a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://eric-parnes.com/ckfinder/userfiles/files/mudakonev.pdf In PDF document text
    • http://radissonhoteltraining.com/userfiles/file/21793634274.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/43702598794.pdfIn PDF document text
    • http://dasbluemchen.com/mupix.pdfIn PDF document text
    • https://olterus.net/contents/files/20235057952.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/88956197598.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370014adccd---48173038491.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/97727620201.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/tulonepavupixufajo.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/55969924764.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109111112161278.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/1078798591.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/79068915402.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/gowumuleneduwe.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/98808141632.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/68068177455.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/govepi.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/53025274256.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/34990191139.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/gomomovotitofadakaxiz.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73839552996.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/saxize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=njan+malala+malayalam+pdf+downloadPDF 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_off0000d7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF011 19168 bytes
SHA-256: 20f97645c602d39c49c4d56961d049649e300e73e46b23c287b59005cf2dc99e
font_02_sfnt_off000121bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BC 10376 bytes
SHA-256: e39c1474abcd2f23e8a0aaaab9b94971f4fc8c1084e72e5ce0bb06c31ace2c46

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