Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0f0b50a633ddaf…

MALICIOUS

PDF

89.0 KB Created: 2021-03-03 19:19:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 7db1942c2e0ee03e299b1a46685dd87a SHA-1: 9981d1138272e74580a8503774e2ed8a00205da8 SHA-256: 5f0f0b50a633ddafe0b0c8276c4ba7f5e0fc982bbacb0f57730109fe4db76101
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is designed to host a large number of external links, likely for SEO manipulation or to distribute further malicious content. The presence of embedded URLs and the document's metadata, including the authoring application 'wkhtmltopdf', further support the analysis.

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
  • 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.
  • 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://jottigo.ru/strik?utm_term=weight+lifting+program+pdf PDF link annotation
    • http://legovimoz.iblogger.org/photoshop_3d_text_font.pdfIn PDF document text
    • https://pisukobuvasojab.weebly.com/uploads/1/3/4/3/134398412/e21ec09d8422.pdfIn PDF document text
    • https://zomereke.weebly.com/uploads/1/3/5/3/135397468/5671066.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/taturi/autodesk_bim_glue.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/house_albums_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/ijazat_hai_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/jogurezazaromiwaju.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/mastering_elliott_wave_principle.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/nutrition_dunkin_donuts_glazed_donut.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/38836206468.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/biennial_update_report_malaysia.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/zaxadimetinepokat.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/keto_recipes_cookbook.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/vorixekarowokunis.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/mercedes_benz_a_class_2018_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/thesis_writing_guide_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/bravos_xl_washer_codes_5d.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/commandos_4_game_free_full_version.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_off00011b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B94 5288 bytes
SHA-256: 6708825c215d084fc1df4a2d7774a7c7a0017d9f23115a4dddf4a42e67360bde
font_01_sfnt_off00012d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D77 12372 bytes
SHA-256: 6d758ce9579074afd2e1610e54f6a74e33b41f721d1ddac6e0626e33f5c00609

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