Malicious PDF — malware analysis report

Static analysis result for SHA-256 6754e5767dff3809…

MALICIOUS

PDF

90.4 KB Created: 2021-03-18 15:22:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 040a5ca73865f6431e921c52d9b3bcb8 SHA-1: 532e612ab0d7471389966926f631881062a0cc25 SHA-256: 6754e5767dff38098db0d0d216641c129eb41f2d61768232395ff57222f3bda9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://druttle.ru/award?keyword=baixar+livro+as+catacumbas+de+roma+pdf PDF link annotation
    • https://topemarepebide.weebly.com/uploads/1/3/4/3/134316461/gilelobef.pdfIn PDF document text
    • http://de-bewertung-id2842384.icu/bayliner_capri_1950_swim_platformusxux.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/antivalores_concepto.pdfIn PDF document text
    • http://shmelev.pro/voxanuwujewidupezwbhe5.pdfIn PDF document text
    • http://uspeh.icu/jusuzaxadepobfa4j.pdfIn PDF document text
    • http://grenkasalo4.xyz/8250234987373473.pdfIn PDF document text
    • http://tokepubex.getenjoyment.net/el_caballo_de_troya_gratis.pdfIn PDF document text
    • https://rulusekiraz.weebly.com/uploads/1/3/5/3/135322703/4850533.pdfIn PDF document text
    • https://jafipununevov.weebly.com/uploads/1/3/0/8/130814040/jukudadofanozowupex.pdfIn PDF document text
    • http://wedasuf.getenjoyment.net/all_falls_down_piano_sheet.pdfIn PDF document text
    • https://kazimiposaduvab.weebly.com/uploads/1/3/1/1/131163956/4003e8ab.pdfIn PDF document text
    • http://lafowesezojo.scienceontheweb.net/femanibodivipekupobepob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.fontrix.comhttp://www.nhncorp.comIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a23e285-5cde-4d18-a604-9f5e5b8ac380/strongs_concordance_1118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c4b8a13-00ce-4962-90db-1cc8aa411711/92057029291.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/buzilexufonigurabup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ef04d08-5040-47fa-a9ba-5f61cf3c29a6/zefuvinopibunuxe.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/xodibedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/786a7495-70be-4e8c-b08d-322caa491ede/monitoreo_de_redes_open_source.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a4a0f4c-2e4e-45d9-9fc6-62d83fb80abf/where_is_the_house_on_mango_street.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14d03dd8-e923-42cd-8a1e-28483b9209e6/buxuvota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/324cd036-750e-40ca-a09b-5c9fb48112ec/18826558020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/186144b2-3792-43ac-a527-4cc87ce38de0/blue_book_value_for_cars_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c28d26bd-1eff-4549-8d57-b13192e3ac53/1684757295.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a95b4e1-0352-4229-b1cb-f7c69846f75f/how_to_get_mean_median_mode_and_range.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/nemusixolobomotenoxisike.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/lijupe.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/appeal_letter_for_school_template.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_off0000fc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC94 5620 bytes
SHA-256: 9cf5c0596fa6b0d73483df54d852c253c314ed3316581245028a5a451c0919cb
font_01_sfnt_off00010f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9C 14144 bytes
SHA-256: e4e9e9c8c2da76ce918b04aa4928895f3d1be33d6013e934fe3510a89a27c9f1
font_02_sfnt_off000139e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E0 2072 bytes
SHA-256: 99dc99f891051cdbd138958a66ea6383a557cc7486c0c5acb0cb3ed99139840e
font_03_sfnt_off000142e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E2 16452 bytes
SHA-256: dfeebb44cf16d337e82d4774cb181783b8bf2674c4649c62238462e69ef025ec