Malicious PDF — malware analysis report

Static analysis result for SHA-256 7111208375873590…

MALICIOUS

PDF

82.9 KB Created: 2021-09-13 21:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aab0d92ece11b9c33eba1edfbdba69ef SHA-1: c0ec5202a11e2552d3dc7d7a26d3122eec57b0ec SHA-256: 7111208375873590201f02d18fb909d13f13519eb898c0df9a4f98c31d893887
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs pointing to a link farm, indicating a phishing or redirection attempt. The PDF structure and the presence of external URIs suggest it's intended to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gonguyenkhoi.vn/upload/files/sarelebakokonorosakemat.pdf In PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/megagemufakeroxaro.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/42344669317.pdfIn PDF document text
    • http://laduses.nl/image/file/52802704007.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/dasataburakiboxixiz.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/66586711939.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/6474422250.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/66086382579.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/rarovazalorepokumaliwof.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/93717380716.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/popikumamiduragoriradil.pdfIn PDF document text
    • http://sudeoksa.com/userfiles/file/20210912215746.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/kojesimodadavomowetod.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///64740915210.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210913103052_drdupx.pdfIn PDF document text
    • http://fitviewer.biz/files/file/natojodaxaririka.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/33845874456.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/mitexomikuwuzobosido.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161320f9010368---bolinir.pdfIn PDF document text
    • https://phukienbep.net/media/files/59503651396.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/zadebofer.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/zobivuserew.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/20919855204.pdfIn PDF document text
    • https://digireg.cz/upload/pigarufusofojukemuvojug.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/19923997365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=android+live+photos+2020PDF 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_off0000de3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF656 10616 bytes
SHA-256: bdd6ea0fa248d3aa77120ab9de0b7d034622a1c49d5178d3314428fabc95a9f6
font_02_sfnt_off00010e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8B 18236 bytes
SHA-256: b15889f67dccdd7c5816cd0db840b2a5350ca682504775becd129f942fe1ecd6

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