Malicious PDF — malware analysis report

Static analysis result for SHA-256 c710073d2170a2f1…

MALICIOUS

PDF

86.8 KB Created: 2021-03-28 20:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e5154fba56be044a8392abda9a2ff043 SHA-1: eb28cd72502a909c431249da02f78932ac822dea SHA-256: c710073d2170a2f16af1b054c95d1bcf47f3760451e861ad9dc116ac73d832f3
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic and ClamAV detection. The document body, though heavily obfuscated, appears to be a lure for a "Mechanics of materials 8th edition solution manual pdf free download". The ML classifier also flagged this PDF with high confidence. The primary IOC is the malicious redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://crophysi.ru/strik?utm_term=mechanics+of+materials+8th+edition+solution+manual+pdf+free+download In PDF document text
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5fcda9c2285ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380223/normal_603b6cc28cd76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406170/normal_5ff94eaa9b2e2.pdfIn PDF document text
    • http://dalutufajako.22web.org/biceps_tendonitis_exercises_spanish.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407552/normal_6008c89f0aa88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463266/normal_5fcb9edabe3d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412763/normal_5fd9121fd37a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501654/normal_5fc88db52b05d.pdfIn PDF document text
    • http://kotovifa.iblogger.org/modern_calligraphy_practice_sheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370560/normal_5fe75aa090458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417535/normal_605d77df8b130.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472208/normal_603d41747c55d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380403/normal_5fe72586d57d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390641/normal_600b3af77abf0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/asian_history_reviewer_with_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c6f5339-2aa7-4020-9dd0-7039c1a442c5/tumamexosisavidisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf4da02-ca30-41e4-bf66-0e4bc8910cd0/healthy_breakfast_smoothie_recipes_for_diabetics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/376ec463-6dfe-4ff3-adc3-22e4596fb251/when_god_wants_you_to_be_alone.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/debokud.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/affliction_warlock_classic_guide.pdfIn PDF document text
    • http://mutomipana.rf.gd/52105426111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94c80792-b405-44b5-a7ab-5a40f18eed11/12617066808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fede5c9-39c8-4bfb-be62-6260b0f72e59/how_to_set_a_home_page_on_microsoft_edge.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_off00011416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11416 5688 bytes
SHA-256: 00aab72e9860968ec0098e7ab06fa032c845edc5d00e55e9fd6353218ab0e10d
font_01_sfnt_off00012765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12765 11220 bytes
SHA-256: dfb84a779bbf7818bae9157e43b98e3b88674d8bd804735fef1e2e6505574975

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