Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b261eea78e4c99…

MALICIOUS

PDF

79.7 KB Created: 2021-03-24 09:39:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 277b8c9ea68fde25093ff611b4b478ab SHA-1: 977c9dcd7a9eaf9d3757942e556ddd1ffd5142aa SHA-256: 68b261eea78e4c991c1d18797cf05143843973717b4f7cf8cce06d7ea9d4de44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier further indicate malicious intent. While no scripts were explicitly extracted, the embedded URLs are the primary indicators of malicious activity, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/123?utm_term=cleopatra+movie+dual+audio+free
    • http://kovuzaxaf.medianewsonline.com/vivewavenepitupula.pdf
    • https://cdn-cms.f-static.net/uploads/4393900/normal_600fc157243e6.pdf
    • https://fozuxuvaporoj.weebly.com/uploads/1/3/1/8/131856883/6352138.pdf
    • http://vevufilusik.scienceontheweb.net/joint_probability_distribution_examples.pdf
    • https://pevolevu.weebly.com/uploads/1/3/1/6/131606362/1114960.pdf
    • http://biomaniix.website/26710339341x6re2.pdf
    • http://hookup153.fun/261277109891mhcw.pdf
    • https://static.s123-cdn-static.com/uploads/4459630/normal_60054b7facd02.pdf
    • https://kesuvovim.weebly.com/uploads/1/3/5/3/135317554/494cf3a68.pdf
    • https://cdn-cms.f-static.net/uploads/4426960/normal_601f9e02a54b3.pdf
    • http://lakshmi-store.ru/guvewujukrqzl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_5e32afab1eef4a4e995f4fb3f91d5b58.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cc09ec9a-45ff-4914-bdc1-d755080b7f39/sledziona_u_psa_polozenie.pdf
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_7bd6f4e27ca249b3b1e7fcd70133692a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/407c7a90-4952-40d1-8b98-15220b6fee8f/76884242478.pdf
    • https://uploads.strikinglycdn.com/files/065e9aee-0397-49d4-a569-c707a9d6908a/kuvepivozonikitotunavaza.pdf
    • http://kozogasivufi.myartsonline.com/metun.pdf
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_18c10747b9794b44b6a7229ef749c211.pdf?index=true
    • https://0aed7b51-d02b-4864-a6bb-b478bb809667.filesusr.com/ugd/fbdaab_3d1e42ca9a3f46e5a691f808e3d2457d.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dce3.bin
c682fde90327e6712514a5bfa8eb07047b1b187aa431940930f710d31b0af88c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE3 4972 bytes
font_01_sfnt_off0000edb9.bin
42e2044efbd2468b164e9a2c82626c7e6c9471b7d1b80125d046bedddf529d2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB9 15900 bytes
font_02_sfnt_off00011c38.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C38 16204 bytes

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