Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd5b5d887214fab…

MALICIOUS

PDF

66.7 KB Created: 2020-12-05 23:56:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2e5912ae8cb798f6cc58d714bf419339 SHA-1: e8744e20be458bd2a8805eba3328b86e673e6e03 SHA-256: dcd5b5d887214fab480d7b15cc9d912d1dfc4f146f3b56b2718fa9977e17b26e
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document that contains an embedded URL. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URL, https://trafficel.ru/aws?utm_term=mixture+problems+with+solutions+and+answers+pdf, is likely used to deliver a malicious payload or redirect the user to a phishing site. No scripts were extracted, but the PDF structure and embedded URI are indicative of a phishing or malware delivery 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://trafficel.ru/aws?utm_term=mixture+problems+with+solutions+and+answers+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413117/normal_5fc9c2c4b4320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428061/normal_5fa85972e5a50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392664/normal_5f91b87417651.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374703/normal_5f9c41cb0ae66.pdfIn PDF document text
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/kosew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc558d58139af037662b603/t/5fc694edf81c9a2a0c8a6094/1606849773717/girl_hero_costume_2._0.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf59b461e25426e12fdcd9/1606375864081/bizifutosebexijivimir.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/53256304532.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2d70d1c8c7413143e99c9/t/5fc92afb34e0031145178447/1607019265388/38422482731.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/chowkidar_full_movie.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc380a327a199023ac5df36/t/5fc5f1eef81c9a2a0c7098cf/1606808047542/71344673326.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf583aeaf37e3b6492f015/1606375483494/subway_surfers_unlock_all_characters_cheat_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7aadcfa9ecc3978a0d924/t/5fca8f77f1f62239f1870e3a/1607110520277/zagonudodeti.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_off0000c7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FB 5588 bytes
SHA-256: 9fa1140fad8ac76cf669c56d3581ef10eb9cb4b8b4704d6668c2598c8a063339
font_01_sfnt_off0000daed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAED 10124 bytes
SHA-256: b8f323499ae6009a242a0bf1b852c769fe1609cd677743f24537a461b868ef57

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