Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eeea3824f23795e…

MALICIOUS

PDF

92.2 KB Created: 2021-04-23 19:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a9b324f704113281d19c59b618dce982 SHA-1: edddb2b963a1668de8c1081995231eb854f7d069 SHA-256: 3eeea3824f23795e9ea7635556bec96503cd35dbd29997e9e233f7de9f494293
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a PDF link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. The presence of numerous external PDF links points towards a phishing or SEO manipulation scheme.

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
  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=of+mice+and+men+chapter+1+quotes In PDF document text
    • http://sizijevoji.iblogger.org/conveyancing_assistant_cv_template.pdfIn PDF document text
    • https://gurelupukuji.weebly.com/uploads/1/3/0/7/130775622/tegekunikuje.pdfIn PDF document text
    • https://xewezepi.weebly.com/uploads/1/3/0/8/130813550/lazepigobafawu.pdfIn PDF document text
    • https://dutukoviwu.weebly.com/uploads/1/3/0/8/130873875/a0b18123d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nixewawomito.epizy.com/37884173632.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/cassiterite_crossword_puzzle_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/91087729157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9291056-5ea8-4ce0-ae0c-de05d3a6f76f/is_there_a_calgary_sun_paper_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5667346-5e59-4c45-9322-117b62f4f5c0/biduzega.pdfIn PDF document text
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_abd5be27513a4b9f95a7cea23065639c.pdf?index=trueIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_8df63768fbd54a939f848f09afce8448.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pirosisob/zivesupanujanub.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/95935566597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df241bf9-1e5d-4fe2-a64d-acfab8782b33/lords_of_chaos_stream_netflix.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/59617734138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8261ffe1-ff85-47cd-8a1b-10d0ba588641/banojonajexebu.pdfIn PDF document text
    • http://soditunasi.rf.gd/introduction_to_fourier_analysis_morrison.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe46d280-1ca4-4f2a-861d-6ac4645ecf48/metric_system_scientific_notation_worksheet_answers.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_off00012961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12961 5568 bytes
SHA-256: 41aa2226808efebce71eac992f31c41748f36ed52f7164cc3803d634a6427f21
font_01_sfnt_off00013c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C24 11220 bytes
SHA-256: 811ed9bfe202824fd6c34f92f17b6b6971d32281ac8f43913870439763e73b2b

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