Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52c656aeee9a737…

MALICIOUS

PDF

72.2 KB Created: 2020-11-09 19:04:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c47562b437c51727f95310162cdda39c SHA-1: e727808962dc763d1ae01fea58dd9cc2d5088d4b SHA-256: e52c656aeee9a737cce281d7cb5b7481733c0951759cce3168e0720a2c49c05c
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL, 'https://traffmen.ru/123?keyword=cross+reference+for+ngk+cmr5h', is the primary indicator of malicious intent. The document body, though heavily obfuscated, contains text related to cross-referencing, aligning with the lure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/123?keyword=cross+reference+for+ngk+cmr5h In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_5fa345dc92663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471235/normal_5fa736435101c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387586/normal_5f8e19d3b0853.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/ffb73a9d-0ac0-4b8e-81d7-447780313cd2/mukeginujogukaxapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4669c9b3-13df-4690-b44d-1a6f886aed36/povima.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/classic_wow_live_leveling_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ea59e84-d04f-46bf-a64d-d8431b099719/46055812332.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/matematici_discrete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/913091b7-572c-402e-8411-d2084fe14c31/2019_-2020_calendar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/583a057e-a4d4-476d-93bc-9c34a1220215/wigusadali.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/24797935129.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/vpn_tethering_android.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/crud_matrix_definition.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20B 5148 bytes
SHA-256: 5900b84dd96228fb1cb959592434b957391dc7afc64db83b9baca966e0d988b2
font_01_sfnt_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 2608 bytes
SHA-256: 66e62fbc54755efe86d419880f93e7cf61764d7bb60db8743557d8e91271f024
font_02_sfnt_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 10648 bytes
SHA-256: 77a30b9af79e9b6fe465db7d031d93666db2b7c3d2f024af6c3abe9323f32dd3

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