Malicious PDF — malware analysis report

Static analysis result for SHA-256 571fe472e240bd70…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 20:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b7bee380e5ca2d6b5185778078f1c2a8 SHA-1: 11bb4d9aefc72242ad07105eeb6fce31ed140a31 SHA-256: 571fe472e240bd70dc5de1ae7a508178574bd735b3d5ae1dedc224e3b989a5da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. Heuristics identified it as a link farm with numerous external URIs pointing to disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were directly extracted, the PDF structure and numerous embedded URLs indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://xn--b1akwe.xn--p1ai/userfiles/file/38868154894.pdf In PDF document text
    • http://growlink.biz/userfiles/file/19803039068.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/13488850426.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/95657040215.pdfIn PDF document text
    • http://soc-in.com/data/media/files/31756010911.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/26401458521.pdfIn PDF document text
    • http://kco.su/userfiles/file/56672916946.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/fenamixafakolikuminapurun.pdfIn PDF document text
    • http://mcutech.net/files/98450274830.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/33176797654.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/mutulelomexuxememujef.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/50412168179.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/021100417349.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/dadikutuwematazuves.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/zimomazutegeboniluzaxonal.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/pebefowideka.pdfIn PDF document text
    • http://ergakiland.ru/files/files/48505145872.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b5aa2293e---55543987831.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/jodovozogojoworomedafovu.pdfIn PDF document text
    • http://lulanjina.net/upload/files/kidomonomanenetexuro.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/50123259636.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/33707711374.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/gufajidisosuxanakosotut.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/4324952474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=antutu+score+snapdragon+720gPDF 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_off0000da21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 17912 bytes
SHA-256: 5d910d77f12e76e3fb204d80e7dc27e37b863ebc4caab33bc90d611c040c1468
font_02_sfnt_off000120b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B3 10924 bytes
SHA-256: 354cd90f55a3a3eb2d8606c59514d3c4f6d4bc0d8ee1f9def5ad9d54dfac1ee3

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