Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f367e6adc20703…

MALICIOUS

PDF

85.2 KB Created: 2021-03-20 15:47:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1b75d505eb6f2ad3722b67418a51d4c7 SHA-1: 07797deec944428e3f59f0b4e215b8333961ffda SHA-256: f3f367e6adc207031b3cd015bb0b8ca9b7cefed37e37e0fca4aa40dc98b64c41
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/award?keyword=area+of+a+circle+worksheet+pdf PDF link annotation
    • http://avto-document.site/81600390415o2l9u.pdfIn PDF document text
    • http://mmuuue.space/logic_pro_9_crack_free_downloadb9q2t.pdfIn PDF document text
    • http://edalovert.xyz/politically_incorrect_guide_to_the_vietnam_warvm85x.pdfIn PDF document text
    • http://sogejovep.mypressonline.com/can_you_really_learn_spanish_with_rosetta_stone.pdfIn PDF document text
    • http://5-euro.info/kefegibutavaparagov7sh0.pdfIn PDF document text
    • http://ihsteam.ru/is_lg_stylo_4_a_good_phonec728d.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/2019_jeep_cherokee_radio_problems.pdfIn PDF document text
    • http://kebenoda.scienceontheweb.net/tuzobuwamuzilobuvakewufer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://deronug.epizy.com/reba_ergonomics.pdfIn PDF document text
    • https://e29f0852-aa8c-4fc4-a5db-fcd144ab7086.filesusr.com/ugd/b730be_2b8c327f16424a0fb3ea339ec5d09ea7.pdf?index=trueIn PDF document text
    • http://xafamikipu.epizy.com/77885132817.pdfIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_21f0ca20338046cbb23b031fec1ff97b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/199d5cb3-401a-4a01-9dbe-26e6d8594814/que_tipo_de_grafica_es_de_una_funcion_cuadratica.pdfIn PDF document text
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_d069fc23662149a5962e50558ac66c18.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_9c28c60f934f4e189942e124ae8e5fc4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a9091a3-1d46-44d5-910e-db71189ca3f6/gomojajit.pdfIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/how_to_identify_a_logitech_unifying_receiver.pdfIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_d0c9f1f981114ff5b88da9da28dd7406.pdf?index=trueIn PDF document text
    • http://biwosagamivi.myartsonline.com/what_is_a_good_fence_charger.pdfIn PDF document text
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_e0c3e0e5ea784303ade75e5f7eae0ba4.pdf?index=trueIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_c7f4ac391cfd4b54a8acd08bb265d1ed.pdf?index=trueIn 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_off0000f3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DC 5388 bytes
SHA-256: 9585ef4b3fced0a085896a971987339dac059e75c7b3d825511f0e3b47c9b51a
font_01_sfnt_off0001063c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063C 12048 bytes
SHA-256: d48102dbfc9ad03f1bae19b47a1dd588c687979e8b02479e54835ba709774b89
font_02_sfnt_off00012f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7C 16324 bytes
SHA-256: 4d37d3f56ffa0f30472f5a71489ff22d007e14c880ce55d0d38f01dc599c577b