Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e7d875e9da4171…

MALICIOUS

PDF

78.0 KB Created: 2021-02-11 13:29:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be5d58d5a22dc6118de4ccfbab0686c7 SHA-1: 2d946a66907cd027be34fa0b6b37679ae4823ce9 SHA-256: d1e7d875e9da417111450d726dcadca7827218cc09ca14701af6c1a67b256c4c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as game guides or academic papers. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/123?utm_term=royal+envoy+3+level+66+expert+mode
    • http://natur-bio.space/regional_geography_of_canada_7th_editionr0g7t.pdf
    • http://vinnipoh.space/zomidonazuraqp57w.pdf
    • http://effektzhizni.ru/bored_button_emoji_quiz_answersr12xt.pdf
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/2f237da660a81e7.pdf
    • https://static.s123-cdn-static.com/uploads/4490365/normal_600447766fbd1.pdf
    • https://static.s123-cdn-static.com/uploads/4447108/normal_5ff91e74e8f7a.pdf
    • http://samyog.ru/tobegefxqib5.pdf
    • https://lewaxirilukuxod.weebly.com/uploads/1/3/0/8/130813115/vegaxaja.pdf
    • http://axecheat9.xyz/sense_v2_flip_clock_weather_not_updatingxppd4.pdf
    • https://static.s123-cdn-static.com/uploads/4417644/normal_5ffd55adcaf2f.pdf
    • http://pocki.top/fuposujufoboxajizlggxt.pdf
    • https://static.s123-cdn-static.com/uploads/4370264/normal_5ffb435a9e0ed.pdf
    • https://nawawedivoxoni.weebly.com/uploads/1/3/4/7/134719505/xezefogezogufi.pdf
    • http://scm03.ru/watch_my_little_pony_episodes_online_free2w84j.pdf
    • https://cdn.sqhk.co/mowanideju/pF2jajh/rimajuvaxoxujezaxobufugej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jifedefujodu/astellia_online_scholar_guide.pdf
    • https://s3.amazonaws.com/nopomewegobij/o_que__capitalismo_tcnico-_cientfico_informacional.pdf
    • https://s3.amazonaws.com/robumuduluwise/remefezadofevosokes.pdf
    • https://s3.amazonaws.com/jupevuxirapi/wibuweresonexoru.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_off0000f5a3.bin
22a893862b948c9571c0ffd1f2a9c36b68f59c683461c070e45528c7f0e54758		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A3 5480 bytes
font_01_sfnt_off00010844.bin
2ae3dc9797ac185a7b23147a786e9306cc1da7d070ef91c2252096539167af99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10844 10076 bytes

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