Malicious PDF — malware analysis report

Static analysis result for SHA-256 873b11d56854dddc…

MALICIOUS

PDF

88.3 KB Created: 2021-02-01 03:53:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9787e0ac6ec0bd2638246ece503daf24 SHA-1: 1725e22ee38c280e4e6b11ab2b0844a5537228b5 SHA-256: 873b11d56854dddc425e78aa85ec283f4d2cac6ae022d3f46003a52e16089b8d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains commonly used in SEO link farms or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, indicating an attempt to manipulate search engine results or redirect users to malicious content. While no scripts were directly extracted, the presence of numerous external links suggests a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/123?utm_term=light+and+shadow+hiroyuki+sawano PDF link annotation
    • https://toruganaduloxo.weebly.com/uploads/1/3/5/3/135347606/533043.pdfIn PDF document text
    • https://cdn.sqhk.co/rovifatira/gjijgch/spine_tattoos_for_guys.pdfIn PDF document text
    • https://cdn.sqhk.co/lufezeralon/Yibjjjg/forgotten_weapons_youtube_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/ghjbgiT/buvataw.pdfIn PDF document text
    • https://cdn.sqhk.co/xidupesijij/egfUvhh/war_of_the_worlds_2019_streaming.pdfIn PDF document text
    • http://vofefipegurixu.iblogger.org/adivasi_film_hero.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477913/normal_6016e0868c951.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/novifamigot/nespresso_capsules_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/tawexaguzag.pdfIn PDF document text
    • http://wonumamirevaz.rf.gd/asphalt_8_hack_ios_no_survey.pdfIn PDF document text
    • http://bajipodi.epizy.com/boxuguguzamupenasosisa.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/broken_heart_images_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43D 9596 bytes
SHA-256: b45c3766fd426b951aa478516381ca661cf8f68417f1f2636e76739c447afa73
font_01_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 5252 bytes
SHA-256: cb02588a9f25d65748c04db267f99f74e056da6dfa83d98e521b778745835242
font_02_sfnt_off000115dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DC 11984 bytes
SHA-256: 8a26963355f01c205ea5cbb3deba870918469f5d603773ebaca75b2b0cf8cc2b
font_03_sfnt_off00013e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E25 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e

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