Malicious PDF — malware analysis report

Static analysis result for SHA-256 484dc3e20f846350…

MALICIOUS

PDF

71.9 KB Created: 2021-03-02 23:53:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8dc67a2d2dc1431d003744588c265503 SHA-1: aeb03ac2006535b83bfc509f3564b459f36511dd SHA-256: 484dc3e20f8463509578b64bc1e207d2459d9afb6fdd08c97e24e126c3543ab0
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://dafemum.ru/award?keyword=how+to+wash+braun+series+7'. This URL is the primary indicator of malicious intent, likely serving as a lure for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment.

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
  • 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://dafemum.ru/award?keyword=how+to+wash+braun+series+7 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374859/normal_603bd7187f5b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423460/normal_601b4bd9432b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407086/normal_6039657157cae.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/9a1dfb1c3f492d.pdfIn PDF document text
    • https://bexukisutiso.weebly.com/uploads/1/3/0/8/130873741/tanute.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482191/normal_5fc6967a1dc94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445733/normal_5fe25ef8d25d2.pdfIn PDF document text
    • http://yarrebitteh.online/buy_slot_machines_near_mewdfa6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388426/normal_600670999de0f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lusuzajemofim.rf.gd/56574119419.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/ccna_1_chapter_3_exam_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/albacore_white_tuna_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/devuxuxodomipe.pdfIn PDF document text
    • http://nemojasa.epizy.com/best_amharic_books_free.pdfIn PDF document text
    • http://poxemibusap.epizy.com/62315334497.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/32057914108.pdfIn PDF document text
    • http://sapirilogive.epizy.com/taliniruwezugebarunixive.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/haircut_places_open_near_me_now.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_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 5012 bytes
SHA-256: 33397c2f9086ed0b06276c239a64d223c3e8d4b5b80c89ea3a7cd90e632a677d
font_01_sfnt_off0000f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 10060 bytes
SHA-256: 4189415952b6d3726fde01d99ea4461c8f4144328e97544e8b2ebc3831c0373c

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