Malicious PDF — malware analysis report

Static analysis result for SHA-256 50bfc6e350a8795e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 03:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 54daea3aa37a0ea3772bfa3886bc4518 SHA-1: 048d29ade6c1471c5c1dbccb8bbe72e880e2c9fc SHA-256: 50bfc6e350a8795e0833f8d3f7cf8013f2954ddb4baa57bf48a4bb2a2ed31a2b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojanized document. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, suggests a link farm designed to obscure the ultimate malicious destination. The document's structure and heuristic firings indicate it is likely a lure for downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://yunnanyingxiang.com/ckfinder/userfiles/files/29791970521.pdf In PDF document text
    • http://cameragiaminh.com/upload/files/40882021930.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/e3a32bbc2c5b984cc1ac219af98a61c7/nekomejonuloxigigozev.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/sirekuxudurisatadisipi.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/lesixuzexuxopuvu.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/guvujosamagefavomu.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/86818639293.pdfIn PDF document text
    • http://hotechike.com/files/files/kokoduzawok.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/415501199.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/mivomegajemikogitizi.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/38951140897.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/lakiwagejobalezelefalalur.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/lesebexebatunebikufo.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/93370389907.pdfIn PDF document text
    • http://1careglobal.com/upload/files/16796642701.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/nosegalami.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/wivib.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/bilubenizipe.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/guzisasov.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/folovawepebixojepimom.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/wakusovazinowififemipeg.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/49320724760.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/darakagejebusur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=forza+horizon+4+free+download+for+android+no+verificationPDF 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_off0000dd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD10 17356 bytes
SHA-256: 69796aaa496681cbb5545add44586dcd656aa20c5c7720ae2e6c6fa7861fb9f2
font_01_sfnt_off00010a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A47 10672 bytes
SHA-256: d5767d6db83f0ac6bb5cc67bf6e3bd9d16624fe472252024782c874dfcf9e1cc
font_02_sfnt_off000122c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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