Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea7d8be03334da0…

MALICIOUS

PDF

107.5 KB Created: 2021-03-20 16:57:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bdb62dea6fd1d899ee74365702e05d3 SHA-1: dd08ea627f594e5283951e889f79647fd4fc15a2 SHA-256: fea7d8be03334da0f55e56ecc703d462b9fccdb8b0cdb574626b5fe832c883d2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains a large number of external links, many of which are likely part of an SEO farm or phishing campaign. The document body is heavily obfuscated, but the presence of external URIs suggests an attempt to redirect the user to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the linking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=alfonso+reyes+poemas+pdf
    • http://jivavesomuviz.getenjoyment.net/duravulebegojavubufiga.pdf
    • https://cdn-cms.f-static.net/uploads/4378164/normal_6012bc9dc7d23.pdf
    • http://wijetaz.mypressonline.com/what_is_an_ivr_pin_for_unemployment_colorado.pdf
    • https://cdn-cms.f-static.net/uploads/4418590/normal_6026eebf65bc5.pdf
    • https://static.s123-cdn-static.com/uploads/4484093/normal_5ffa6c3ac0e68.pdf
    • https://cdn-cms.f-static.net/uploads/4403539/normal_600b636a1879a.pdf
    • http://fiziwafofekaku.mygamesonline.org/55639329030.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_79608f68d9ff4f3e8262c510efd9ce10.pdf?index=true
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_0c5ed10a8ce64e37afa941ef0ed022ba.pdf?index=true
    • https://s3.amazonaws.com/gumegulaxi/dogikosabupet.pdf
    • https://s3.amazonaws.com/regegozumekoza/66279943157.pdf
    • https://uploads.strikinglycdn.com/files/8f4e5848-9b49-4e4c-be30-ea0e9f2c876b/maverick_et-733_long_range_wireless_dual_probe_bbq_smoker.pdf
    • https://s3.amazonaws.com/fefurorobumi/ephesians_6_armor_of_god_kjv.pdf
    • https://s3.amazonaws.com/kawotexulozax/xemexunen.pdf
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_c060b5fef8ec4db8b603eca4a8cd0ce3.pdf?index=true
    • https://s3.amazonaws.com/vekodupiwarobi/attila_total_war_mods_free.pdf
    • https://s3.amazonaws.com/genedesowul/88250693218.pdf
    • https://uploads.strikinglycdn.com/files/8fc9b3c0-31a6-41ac-b87d-f38a76e9e6c5/the_elements_of_moral_philosophy_8th_edition.pdf
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_91514e7b71b2421393f99cfccb518451.pdf?index=true
    • http://wipadafefuxasi.onlinewebshop.net/are_some_ross_stores_open.pdf
    • https://s3.amazonaws.com/dozore/administracin_de_empresas_libros_gratis.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000152fd.bin
6637eea3b07917dda5f68af11975edb6dead9da430b1d78d4c86aeb1095eb299		 pdf-font-stream PDF embedded font (sfnt) at offset 0x152FD 5276 bytes
font_01_sfnt_off000164e3.bin
e6a8422ae6d9e4a080034df90a95e7fe21dbb79e84e3974cf5482f56d0d16dcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x164E3 10848 bytes
font_02_sfnt_off000189a9.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x189A9 16204 bytes

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