Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44f183b162bef77…

MALICIOUS

PDF

82.6 KB Created: 2021-09-14 11:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 2d7f8b55581a0a944c2034f504fb910a SHA-1: 5453566293a4df4f705cfaffe05f12a77b0c5ed1 SHA-256: c44f183b162bef77f85a2a780f746229fced5bc0f434d3b28ab5bfd83f8e90b7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to unknown or suspicious domains, suggests a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, indicating the document's purpose is to host a collection of links for malicious redirection.

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://familiegravesen.dk/ckfinder/userfiles/files/noburoladulazakazoz.pdf In PDF document text
    • http://frezerovka.by/images/fxeditor/file/26650689267.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/gozasemowari.pdfIn PDF document text
    • https://mediaskills.rs/files/2965821151.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/retoxul.pdfIn PDF document text
    • https://italvaping.com/file/jowokosopifojepu.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zuzijifetaxosunixe.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/8390912849.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/69363076764.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/88822094907.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/52998526615.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/5655039817ce39b6e8acdee03036467f/nasexet.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/viliniwujusud.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/28071535961.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/32021438512.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e8d800b0e---22517694416.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/nupetijixujakorofokerak.pdfIn PDF document text
    • http://xenangheli.vn/public/files/56811999326.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/kidisiverapixilerabox.pdfIn PDF document text
    • https://tessuno.com/upload/files/61353b932f095.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/82999571429.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/manoxofumajaxoziwiruvuf.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/97158672843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=reading+comprehension+intermediate+worksheets+pdfPDF 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_off0000ddfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFA 11244 bytes
SHA-256: 12de413af82ae88e8f39b93c17e98661f7951d38a8c76b15cc5808aa25de781e
font_01_sfnt_off0000f7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001100d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100D 17244 bytes
SHA-256: 7cc1a810cd152bea03b4abf90e96e4ca092c4e67ef97895be411c7782282f7f3

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