Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1654bbdfeeebc1b…

MALICIOUS

PDF

109.3 KB Created: 2021-03-14 05:41:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6cbed53f566d9e9c6c69501f7ed539fa SHA-1: ec7b9d884ec41aac8cce3c9623a5bf7c6c584af5 SHA-256: b1654bbdfeeebc1b79f9c2a091885bf86f36e0dec98e33ab4a13f6e3aa2e4747
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by both a machine learning classifier and ClamAV, with the latter identifying it as 'Pdf.Phishing.Trojan'. The embedded URL 'https://nipisod.ru/strik?utm_term=my+rotten+redheaded+older+brother+book+summary' is a strong indicator of a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the detection and the embedded URL suggest an intent to redirect the user to a malicious site.

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://nipisod.ru/strik?utm_term=my+rotten+redheaded+older+brother+book+summary
    • https://cdn-cms.f-static.net/uploads/4367919/normal_60437d3bdf705.pdf
    • https://static.s123-cdn-static.com/uploads/4375350/normal_60033597aa493.pdf
    • https://cdn-cms.f-static.net/uploads/4451945/normal_6029db0e69a47.pdf
    • https://cdn-cms.f-static.net/uploads/4461767/normal_60282be00c2d4.pdf
    • https://static.s123-cdn-static.com/uploads/4466413/normal_600901d96b778.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e0044edd-55c3-4805-b345-0cec59743999/what_does_atypical_mole_biopsy_mean.pdf
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_74053b90094e4a81bb8fd39266d14d5e.pdf?index=true
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_2854aef4d51b4e648b6712d006d03e8a.pdf?index=true
    • https://s3.amazonaws.com/daniwodug/t_r_s_ka_full_form.pdf
    • https://uploads.strikinglycdn.com/files/79800dab-3d3b-453d-bbe6-d37a0f051b3c/lg_refrigerator_service_centre_bangalore_contact_number.pdf
    • https://s3.amazonaws.com/wixanarer/zuzesilinu.pdf
    • https://uploads.strikinglycdn.com/files/41dea110-6165-4b13-9c84-fcb2d213641c/taotao_50cc_scooter_parts.pdf
    • https://s3.amazonaws.com/suzixegazunow/best_algorithmic_trading_platform.pdf
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_a76d9ec7a1a549f8b1282dfb92de0dad.pdf?index=true
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_a622a84870f1464a9e2120115414fa82.pdf?index=true
    • https://s3.amazonaws.com/rebesudanolo/67616583658.pdf
    • https://uploads.strikinglycdn.com/files/2347c6cd-7ad1-440e-9530-c80772843187/shadowrun_returns_android_rus.pdf
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_d1b4ab6c1c7644fba9f2c0c407002c53.pdf?index=true
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_7baab66d1de4405f89535964adb62438.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_off00015825.bin
3f7baef667253188d43ebd08434040bdeff04e6fec022767850624c9d6026236		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15825 5376 bytes
font_01_sfnt_off00016a4f.bin
5c69ad9a649b2028068ab8fadb2096978151b02fb54eb451779d6dd81ef9c23a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A4F 11420 bytes
font_02_sfnt_off00019138.bin
73f6f760a67782f27700c3ed047511a210a1e3765a9cc4fd416c63ff6a2522af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19138 16060 bytes

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