Malicious PDF — malware analysis report

Static analysis result for SHA-256 538b66368fae8fac…

MALICIOUS

PDF

78.0 KB Created: 2021-03-10 05:12:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9828348d549ce0eee921767b492c4a0b SHA-1: 4f648a55dcc101f98e8ff571211fe33ecd8d1502 SHA-256: 538b66368fae8facb090b9ac7b9948f7e36499996862978354b2691e3da6a2c9
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or hosting malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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
  • 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://vilenefex.ru/123?utm_term=miya+bhai+video+song++bestwap.+in
    • https://cdn.sqhk.co/rasepotobami/ggjaAhd/ziwigipivigo.pdf
    • https://silorofolukut.weebly.com/uploads/1/3/4/2/134265947/313028.pdf
    • http://24goodstore.site/34333184150ffl0h.pdf
    • https://fivitilanafime.weebly.com/uploads/1/3/5/3/135395402/2d7a3a.pdf
    • https://cdn.sqhk.co/wepurodapike/iiQJsgi/25662294772.pdf
    • https://fapufeloku.weebly.com/uploads/1/3/1/0/131071019/2230824.pdf
    • https://cdn.sqhk.co/felolavap/KEYicMs/wepeve.pdf
    • https://cdn.sqhk.co/vizelupavew/iidghgd/blockstarplanet_hack_vip_download.pdf
    • http://olipaka.xyz/persuasive_writing_outline_middle_school8xxiu.pdf
    • https://cdn-cms.f-static.net/uploads/4425492/normal_5fd69954516c6.pdf
    • https://tisirobe.weebly.com/uploads/1/3/4/6/134699904/siwexewupovujav-libir-pusovefenid.pdf
    • https://cdn-cms.f-static.net/uploads/4480402/normal_60112e4368cd6.pdf
    • https://static.s123-cdn-static.com/uploads/4427094/normal_5ff52506efa77.pdf
    • https://cdn.sqhk.co/zalenemu/a86hgWE/gawisaruzudowagitovo.pdf
    • http://graatorama.space/formel_1_sky_moderatoren_2019h1zp5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dazinibonofobi/crsu_date_sheet_ba_5th_sem.pdf
    • https://s3.amazonaws.com/zafibimutadoti/how_to_take_apart_kenmore_dryer_model_110.pdf
    • https://s3.amazonaws.com/poresi/58367830653.pdf
    • https://s3.amazonaws.com/purawuma/pidiparefadosifolelupap.pdf
    • https://s3.amazonaws.com/wexoteluwag/soda_stream_gas_refill_melbourne.pdf
    • https://s3.amazonaws.com/bidivo/tagenomanolejoxuwem.pdf
    • https://s3.amazonaws.com/napisakaluja/android_studio_emulator_slow_mac.pdf
    • https://s3.amazonaws.com/padosumifubobo/how_to_listen_to_free_music_on_alexa_echo.pdf
    • https://s3.amazonaws.com/tawosutosuxi/saluzoxujuriwiruwal.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_off0000f0d8.bin
64567f2311f672e8c9a43bf6d7534cb4acc7e2712280ec0b6990e3fd0f2d3214		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 5524 bytes
font_01_sfnt_off000103d1.bin
4608f1453476d2eec656669111f33056d9ac6737037b800d21c7b756a5d398d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 11288 bytes

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