Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4a6dc4518deb3d…

MALICIOUS

PDF

68.5 KB Created: 2020-11-11 12:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc506ae4097362f704b9095ee5f9ec4c SHA-1: 592facbc18624584e6252a58c7a5fb81c4f28add SHA-256: ac4a6dc4518deb3dc4c4c728b76341c23e83a32e90c3b4f98d7aea15f39a9fcb
214 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure related to "microsoft office groove 2010 remove". The presence of numerous external PDF links, as flagged by PDF_SEO_LINK_FARM, further supports a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/123?keyword=microsoft+office+groove+2010+remove
    • https://kotidirexi.weebly.com/uploads/1/3/4/3/134358756/b430e489284024.pdf
    • https://gutakabumediru.weebly.com/uploads/1/3/4/4/134492877/769393.pdf
    • https://cdn-cms.f-static.net/uploads/4370542/normal_5f8a22fdf3211.pdf
    • https://tagekoworiz.weebly.com/uploads/1/3/4/0/134016686/8102016.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/luramamelolem/manorama_year_book_2019_tamil_free_download.pdf
    • https://s3.amazonaws.com/zufaxepixiguxax/hunterdon_central_regional_high_school_yearbook.pdf
    • https://s3.amazonaws.com/woxojuxafopuv/mafia_city_h5_troop_guide.pdf
    • https://s3.amazonaws.com/fukezavazuj/printable_medical_metric_conversion_chart.pdf
    • https://s3.amazonaws.com/henghuili-files2/application_letter_format_for_ojt.pdf
    • https://s3.amazonaws.com/jamokaroxoj/ignou_m._com_2nd_year_solved_assignment_2018-_19.pdf
    • https://s3.amazonaws.com/pisedij/45825160327.pdf
    • https://s3.amazonaws.com/kekunawi/tifunejepunijifemune.pdf
    • https://s3.amazonaws.com/xurixado/arms_warrior_pvp_guide_bfa.pdf
    • https://s3.amazonaws.com/nemafu/dakijipamirumewajebowov.pdf
    • https://s3.amazonaws.com/vigevot/21217860151.pdf
    • https://s3.amazonaws.com/zafaronivaj/lutufafepibobetigunajeze.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfc3.bin
3bb4d4df68652a3e6582a2c7fff0266b1254c78ea559583cd92939cb54d3bb5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC3 5352 bytes
font_01_sfnt_off0000e206.bin
9002a374db9fda5e00ce6b9fd0fb1ac8c3ccbd6babe4437e94424b5db1cfed2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE206 10304 bytes

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