Malicious PDF — malware analysis report

Static analysis result for SHA-256 792a563fb8fcc16c…

MALICIOUS

PDF

78.4 KB Created: 2021-02-20 21:32:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1b41581f8feba8f0a859e0bf2269ce7e SHA-1: 7294ef8e86d4b52bb94c1e2323afef1d0155b81c SHA-256: 792a563fb8fcc16c7df85c9d258e40172fc9d18d24ed3705fd99dc6fbe541103
104 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and heuristic firings indicating it is a phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to 'factoring polynomials worksheet', which is likely a pretext to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://seumenha.ru/wix?keyword=factoring+polynomials+all+types+worksheet PDF link annotation
    • http://runolive.com/2389397619087nyr.pdfIn PDF document text
    • https://gakofalu.weebly.com/uploads/1/3/1/6/131636889/kerowepabeloko-loroxelifaj-jotozavedadij-jejixanavoxebi.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/JwjeFdE/ice_cream_cake_delivery_online.pdfIn PDF document text
    • http://masevetito.22web.org/bioplastics_ppt_free.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/jh5ghgd/vopikuzemotalisov.pdfIn PDF document text
    • http://banepudota.iblogger.org/25910757209.pdfIn PDF document text
    • https://lozibojugor.weebly.com/uploads/1/3/1/0/131069840/moxolugiwali_tomokenatimelo.pdfIn PDF document text
    • https://gebapawuvafiv.weebly.com/uploads/1/3/4/5/134519736/5962737.pdfIn PDF document text
    • http://ziweninuxepip.iblogger.org/67579602769.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rimamosapike.epizy.com/lego_ninjago_movie_minifigures_feel_guide.pdfIn PDF document text
    • http://lelupiborojez.epizy.com/nukepimikipinobimus.pdfIn PDF document text
    • http://sipariwemarisu.rf.gd/26592150581.pdfIn PDF document text
    • http://sekusasumoda.rf.gd/templates_and_inheritance_in_c_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/wejunuxivuluwunexeregujop.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/restricted_holiday_leave_format.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/kerboodle_summary_questions_answers_biology_ocr.pdfIn PDF document text
    • http://pixipisifoxuj.rf.gd/gazimo.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/swagelok_fittings_installation_guide.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_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 5560 bytes
SHA-256: d9b8a53391bfe96b6d39b672142b1e71895b6f03c75d040d77939cbdebbac692
font_01_sfnt_off0001078a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 10768 bytes
SHA-256: f0bf4c7a324743fd11ef764b4525c125d1aff1f94d8717dbf4b0e9d97e4b5645

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