Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b50c77c035ae2d…

MALICIOUS

PDF

69.9 KB Created: 2021-09-17 23:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 574593ceff7821702f3eb944ac5c0456 SHA-1: 531b053182ac635c159b95c6e24f054c777d7a01 SHA-256: 27b50c77c035ae2d0d1d2d23cd1d6ea505b409b8e1cf3b0e6b463158cd548ae9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farm heuristics suggest the PDF's primary purpose is to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://nomylo.ru/uplcv?utm_term=among+us+happymod+apk PDF link annotation
    • http://kalkulacka-hypo.cz/userfiles/files/bigiwev.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109152014003089.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/fefukepoxitexisix.pdfIn PDF document text
    • http://badgerhillfarm.uk/51463590175.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/40488250337.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/13970555010.pdfIn PDF document text
    • http://hkacca.com/userfiles/96537195136.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/gufukamotopigugu.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/vorasewu.pdfIn PDF document text
    • http://philipsphotographystudio.com/61349131279.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/14993201659.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210901110626.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/82863608220.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/37476197205.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/4014432685.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/lifilexanedugeneka.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/zofetagumavinulit.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/wogofepudadamu.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/67518efc25408e15e873cd323ad41077/fezupu.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/55687726305.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/rumabalaxagefakuwelajumun.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/24626416753.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/bezozilidizuburiropenol.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_off0000b1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA15 10656 bytes
SHA-256: 871812e0e8e53d7190b6a3f1889b888fc72ad4ecdbc4599bca9288a65c1f8177
font_02_sfnt_off0000e21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 15652 bytes
SHA-256: 092cb34d7b19175bc83fb914c6bef9d86960a0afbf1b8f2be6230261da58f4e2

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