Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10623c36d6fde6c…

MALICIOUS

PDF

72.6 KB Created: 2021-02-26 06:21:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 35161e5bb0f8df9d478aa9855ccaebc1 SHA-1: b101a7ff0ada86f5f2022a257238a9071ae3f502 SHA-256: c10623c36d6fde6cc21a1bd59bc1fbf1c15ba23394cc2bdf4442eac943fe9a55
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirectors and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain product-related text, suggesting a lure to disguise the malicious links.

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://yafferge.ru/123?utm_term=zegarek+casio+sgw-1000-1a In PDF document text
    • https://kofekatemate.weebly.com/uploads/1/3/2/8/132815318/7865e0.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/ic_2300h_mods.pdfIn PDF document text
    • https://baxiboxizalitif.weebly.com/uploads/1/3/3/9/133987723/3954157.pdfIn PDF document text
    • https://tobivuzulukimu.weebly.com/uploads/1/3/1/3/131384599/2570589.pdfIn PDF document text
    • https://feranipadolop.weebly.com/uploads/1/3/2/7/132740228/d801cdec82d3417.pdfIn PDF document text
    • https://masezinonorokun.weebly.com/uploads/1/3/4/6/134685416/nefopaj.pdfIn PDF document text
    • https://sararilaba.weebly.com/uploads/1/3/1/4/131482808/7254504.pdfIn PDF document text
    • https://mojavopadagesit.weebly.com/uploads/1/3/5/3/135383036/jatepupeluke.pdfIn PDF document text
    • https://gazezujebek.weebly.com/uploads/1/3/4/8/134881616/sulugibu_malogidipeza_tadusokudizuv_vewono.pdfIn PDF document text
    • https://motixovelubebov.weebly.com/uploads/1/3/6/0/136085904/bubalor_pajepija_xepimalakivam_zegiwiza.pdfIn PDF document text
    • https://pewukuma.weebly.com/uploads/1/3/4/7/134762228/7420577.pdfIn PDF document text
    • https://tomadukego.weebly.com/uploads/1/3/6/0/136083679/344ce91cf14441.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/zowibatev/registered_dietitian_exam_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/grammarian_toastmasters_template.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/nanaso.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/bosch_capsule_filling_machine_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/logical_connectives_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/bakevixutaxis.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA63 5276 bytes
SHA-256: 9909000b37e719909813ae21205031dcddc81a0f132d6e39fa34412497341b1c
font_01_sfnt_off0000ec8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 12140 bytes
SHA-256: 4490c948230febee3324bc9df81c2d222b709b1d6c96ad5433c61828e71044cf

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