Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51cdabc9eb659bf…

MALICIOUS

PDF

82.6 KB Created: 2020-12-26 08:35:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 665d2e8c36f2f57171cbb5a582f60668 SHA-1: 85b89be6e473d63d5ae36b3c81ff6128e843d3e1 SHA-256: a51cdabc9eb659bfe1fdebec9676e95d5d7ba84429187bbb50065ca028bcff8b
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'trafficel.ru', which is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to trick the user into downloading or visiting a malicious resource.

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
  • 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://trafficel.ru/aws?utm_term=sql+server+2012+standard+edition PDF link annotation
    • https://cdn.sqhk.co/nerenina/icheXjh/52269592800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481518/normal_5fd99ffaace15.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/geTfbhj/furufupukoparobeseseso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404313/normal_5fdc04195dd86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370791/normal_5f88fdfe8e999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454973/normal_5fd6236e59a81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wuniku/algebra_calculation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/332be505-a0cb-44e4-87a6-ed40444f055a/putorubusoralalixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37088d75-7d22-44ee-8484-e78300fec114/zotesikeragabirun.pdfIn PDF document text
    • https://s3.amazonaws.com/mejediparaxi/what_types_of_zoologists_are_there.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c3d4ddc-7cfd-4bee-82f2-810cdbca888a/38059094376.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb0c53c1-cf1f-41e4-bc3f-1c8dfb1cc154/80952425763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0c5fa4a-185d-4405-9a5c-eea7bb37af36/torojiwegukekigum.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE411 6588 bytes
SHA-256: 24fd6868f187b5667792517f9f69d22ac5a3de5011d4d3824467392effeade79
font_01_sfnt_off0000f48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48B 5436 bytes
SHA-256: 5f475d206f7f013b5b05978653cf9ee2fa5473d44c7d45b7f4d59e1649e4e662
font_02_sfnt_off00010714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 1964 bytes
SHA-256: 409ee9a3885541ffdc58d6bd2d6bfd260a46de59e4270c8c7780dd2af6cdbafe
font_03_sfnt_off0001106d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106D 16368 bytes
SHA-256: 61ec347a48ff958b3ff5ae3b1e7abd045ff8802fe38e7fdcdf3d02ed6699c5e6

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