Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ebf02c96fe4cbf…

MALICIOUS

PDF

58.0 KB Created: 2020-11-25 06:33:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 342b90d731aca8b932d6746fb1be6e69 SHA-1: 2ace71d70edab2c516a4720af4f017eef3b98ee3 SHA-256: 73ebf02c96fe4cbfaf6713c7f3ba7ebd73a90969418a1425374f1ea6b5c8f499
154 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain metadata related to a 'vocabulary workshop' which is likely a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://ggtraff.ru/strik?utm_term=vocabulary+workshop+unit+9+answers+level+d In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369502/normal_5f8b780fa06de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380531/normal_5f9a0170b7da1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf52fd3b-07cd-4117-8056-8e9d556be821/56191248419.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/ham_and_cheese_hot_pockets.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/maguzizogesijalinelogov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52e16e49-ab8e-49d8-88ad-1e36daa3f1ef/1997_camaro_ss_lt4_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96ceab5a-cc26-4d85-abe0-81b51b225d01/metawirusaset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b984522-0f21-4529-9a2a-6ce4de14878e/ramevifofebitix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d00325f2-4194-4100-b8f3-55a566440057/65546077544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6082ebff-2f4d-4ca2-9dc2-b585c60fe198/asus_ramcache_iii_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d86da16-fa5c-4722-846e-cde3ec4298e2/ruwolirazedujoxofovo.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA843 5740 bytes
SHA-256: 40487d23f79e85f15153a479b4195454d7fc0b75c25c29f1d5ea397d306a5e3a
font_01_sfnt_off0000bbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD7 9280 bytes
SHA-256: a47be32f626c5a3620e2b3cabf369fa72c957840528d775fa1ad4e3d96eb0571

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