Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bbe7f1dce2eca5f…

MALICIOUS

PDF

77.4 KB Created: 2021-01-19 21:47:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 70f499f54385a116dc4d225051b764d3 SHA-1: c2e16fcef2849a337de1029c515a17f84da8973c SHA-256: 5bbe7f1dce2eca5fad178cbeac35250e62cfdd95f1d1d35f233640611e3c4569
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic and ClamAV detection. The document body, though partially corrupted, suggests a lure related to "Cambridge starters past papers pdf" to entice users to click the malicious link. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence score strongly indicate a phishing or malware distribution 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
  • 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/aws?utm_term=cambridge+starters+past+papers+pdf In PDF document text
    • https://cdn.sqhk.co/jibenapola/R5nTMNH/traffic_run_app_store.pdfIn PDF document text
    • https://cdn.sqhk.co/javepuju/ajgRKgg/get_free_cell_c_airtime_now.pdfIn PDF document text
    • https://cdn.sqhk.co/wanolugago/heia3ha/73673945139.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/hfqeowt/karedafizagu.pdfIn PDF document text
    • https://cdn.sqhk.co/nexoratuxi/dcagdM3/water_boat_racing_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wejagamewo/ihgQjgu/cs_driving_parallel_parking.pdfIn PDF document text
    • https://cdn.sqhk.co/ratufewebu/5gjtiik/best_digital_school_planner.pdfIn PDF document text
    • https://cdn.sqhk.co/fovuxugo/n4gjgoE/kixumemunerigo.pdfIn PDF document text
    • https://site-1176273.mozfiles.com/files/1176273/13426010663.pdfIn PDF document text
    • https://cdn.sqhk.co/vikoparif/jW4cAgj/the_lighthouse_mermaids_and_madness_scene.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/jcPDgh3/mejubefudemobodir.pdfIn PDF document text
    • https://shop.swiss-exams.ch/produkt-kategorie/cambridge-exams/young-learnIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tadovu/delegation_of_financial_power_1978.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/cadbury_dairy_milk_advertisement.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/la_campanella_liszt_piano.pdfIn PDF document text
    • http://merizipu.rf.gd/57340145504.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/16964144055.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/south_america_political_map_blank.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B0 5376 bytes
SHA-256: e6a32b0f8c769f3d15f62fff39527b76513e495ef527045569b3f33f2264f8f8
font_01_sfnt_off0000ead3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD3 11000 bytes
SHA-256: d481e3360d0a0eba2f6e4ef35d91532fcc8fa6d020aabce95b5c5a6978ea45b5
font_02_sfnt_off00011095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11095 16720 bytes
SHA-256: 986f19063210025a415ba8c44fa60dd68909ae60ba3b23c9948bff12bef59a20

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