Malicious PDF — malware analysis report

Static analysis result for SHA-256 b569a5906e0d2577…

MALICIOUS

PDF

78.3 KB Created: 2021-06-05 09:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e50f6db14f67faf96dc0033fe490a7e3 SHA-1: 9ba6deb90272bc55d603157db3722b5b9f97ad23 SHA-256: b569a5906e0d257760963599bcb0800d8d1e075bb98b2489635e82519fe1cff0
186 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or SEO spam operation. The embedded URLs and the heuristic firings suggest the primary purpose is to redirect users to potentially malicious websites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or traffic redirection schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cructi.ru/pbw?utm_term=br%25C3%25BCche+multiplizieren+%25C3%25BCbungsaufgaben+pdf PDF link annotation
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/8016b09967.pdfIn PDF document text
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/5010140.pdfIn PDF document text
    • https://bomevalaruzaf.weebly.com/uploads/1/3/4/8/134871705/8260d4d.pdfIn PDF document text
    • https://mifetajuluvonu.weebly.com/uploads/1/3/4/6/134610270/lumewalarogin.pdfIn PDF document text
    • https://zefowumuf.weebly.com/uploads/1/3/5/3/135327275/151922.pdfIn PDF document text
    • https://weposatozexutav.weebly.com/uploads/1/3/4/3/134314203/selumu-jegozivuki.pdfIn PDF document text
    • https://vipugexisixow.weebly.com/uploads/1/3/0/7/130775501/2768546.pdfIn PDF document text
    • https://dorugemapakew.weebly.com/uploads/1/3/4/6/134680888/d0b40e.pdfIn PDF document text
    • https://paxazojip.weebly.com/uploads/1/3/0/8/130873894/komejowaxoje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sufizilofab.pbworks.com/f/xagetotobukigimivobogajan.pdfIn PDF document text
    • http://vikowezanipe.pbworks.com/f/rimirawokefunenovefil.pdfIn PDF document text
    • http://labidan.pbworks.com/f/77044095143.pdfIn PDF document text
    • http://nigezid.pbworks.com/w/file/fetch/144635040/star_wars_episode_2_tamil_dubbed_movie_download.pdfIn PDF document text
    • http://sufizilofab.pbworks.com/w/file/fetch/144607335/vitasimatirafelebuxiwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69404321-f68a-4cb7-8c56-5fdfbe0a46e6/how_to_set_up_hotspot_on_iphone_8_at_to_your.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee8c1e78-c57f-4875-9367-22f365f68907/hard_reset_iphone_6s_plus_without_itunes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9cba3af-02df-47c7-8757-dfd143493891/lexalasiledulututijixumu.pdfIn PDF document text
    • http://zusemivak.pbworks.com/f/examenes_lengua_6_primaria_anaya_pieza_a_pieza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2d2e35c-b2be-4d96-9c8d-3d2644b4b739/43208148218.pdfIn PDF document text
    • http://mazibudikor.pbworks.com/w/file/fetch/144603165/88921696682.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 5928 bytes
SHA-256: 78c2fcdef38f59c59d8f2ac6d0501f83e4fa38d7aee9e9093a614ecdd5023554
font_01_sfnt_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 10764 bytes
SHA-256: ba526377b2fbb8fb732a7814f2d503ba498aa78a846a29fa304f98a01e607790
font_02_sfnt_off0001144f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144F 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501