Malicious PDF — malware analysis report

Static analysis result for SHA-256 4503808ac02e5e48…

MALICIOUS

PDF

72.1 KB Created: 2021-06-05 06:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1006d570d82ff1ed14454240b9306515 SHA-1: 4b5e7d9255f28212eedc3fcf9fe08e4e7683363c SHA-256: 4503808ac02e5e48a7c45b6b2bd09ee8ea9b2d6912e1f85fa5a32d4c31009236
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URL pointing to 'allytemp.ru', which is likely used to host a malicious second-stage payload. The document body, though heavily obfuscated, suggests a lure related to a children's reading activity, consistent with a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/pbw?utm_term=je+suis+en+cp+rallye+lecture PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387929/normal_606a38405c6b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484118/normal_6015e5fca3591.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485442/normal_6052d8141292c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460057/normal_60299b528d1ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489247/normal_5ff3a65476366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418000/normal_604129e6b0905.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389571/normal_5fdfc17f84e33.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4388820/normal_60b6e60f18c5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427105/normal_5fe535b83cedd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383304/normal_5fc5e73000232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378831/normal_60326e0085b7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480145/normal_600fa1f905d1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388424/normal_5fd795c34fa6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410018/normal_601a3119d274c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407747/normal_5fed1a995017b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497131/normal_605692be40080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482407/normal_60410da21f8ce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ae4f48cd-fa7d-427c-bada-f735bac70633/how_to_become_a_reiki_master.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95eb4f22-984c-4b8d-b68b-d01608960bb6/84092919967.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_off0000ce69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE69 4788 bytes
SHA-256: 7db800d3f129a2f94b342255a469565f99bbe0e9f1f543fbafd7176e5985c284
font_01_sfnt_off0000debb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBB 11364 bytes
SHA-256: 9e94f2e76ec8cae5cb6b3578554f9b7006f6c6f98c7263784bf7774d3fa0c462
font_02_sfnt_off0001038a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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