Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aee8c52a3c1a7d4…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 03:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e77376d9425d9e4217047c7085c09f73 SHA-1: e5d6c6bdd652aede93924bc8240f859880a4addc SHA-256: 0aee8c52a3c1a7d49693913f8170106777d646ed0e056aa8f523bd6dad0faea0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to direct the user to malicious external content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://seedcambodia.org/htdocs/cljr/data/files/legozezomujexetafiwer.pdf In PDF document text
    • http://www.globalnautique.nl/upload/files/77062138377.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/71139339948.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/50121195047.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/mozipasuxa.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/17851233072.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/muvos.pdfIn PDF document text
    • http://jawarakreasi.com/file/3112266309.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/15017314266.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/72623046255.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/11158379685.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/041428183849.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/bonokapakimuzul.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fdb091f06---dizejijulama.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/zizogapuzixudusuj.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/17677647316.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/gisevazomomevaxejapipi.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/maxor.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/7178503912.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/93198077432.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/rubutujitijexaxawodusoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ffmpeg+compress+video+androidPDF 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_off0000d2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C8 10860 bytes
SHA-256: f2357b01906c97bc2f396be7a7ab13593578d82d3081ade6653fce222dc7ee31
font_01_sfnt_off0000eb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 18328 bytes
SHA-256: a7f2b75abea7a3d7c62b8d11de0b008d07db74588afe7687b8e92afe0eb490f6

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