Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9fb26d9b78c28a…

MALICIOUS

PDF

82.2 KB Created: 2021-03-17 11:28:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6ae04f48f6639342d9e992a7c04bf2e4 SHA-1: 4bc85b82fc34c4a3d897bf3b974505059e61263a SHA-256: 4f9fb26d9b78c28a75790f8218a27600e1219d75153009e74edc9dc0233b63fc
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the overall structure indicate a likely attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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://gimoguvi.ru/wix?keyword=zero+gravity+nationals+2020 PDF link annotation
    • http://zunololanuxigu.sportsontheweb.net/wewetunawej.pdfIn PDF document text
    • http://dufifudusimube.mygamesonline.org/8188955391.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476946/normal_5ff627319062a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460983/normal_5fdfd3181c04a.pdfIn PDF document text
    • http://ninotekega.mygamesonline.org/why_isnt_my_polaroid_snap_touch_turning_on.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426062/normal_5ff8881247285.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469828/normal_5fc716106e38b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459166/normal_60145f8f460a3.pdfIn PDF document text
    • http://betizekaxu.getenjoyment.net/pulse_oximeter_how_it_works.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418369/normal_5fd8cb457a10a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476938/normal_603f5a0e92241.pdfIn PDF document text
    • http://gofadivus.mygamesonline.org/how_to_make_a_slave_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402262/normal_5ff104ac6d614.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jemileti.atwebpages.com/how_many_words_should_a_2_year_old_talk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ac4fbbc-0180-4f5e-a747-8ba13d99d1bf/what_martial_art_does_special_forces_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0983549c-2c1d-46d5-8602-5c1c54bb5931/27585376338.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/xokelowajebuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/193c0efd-3af8-44b6-af40-3c3f0a8927e9/xuwupemorume.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/55145398066.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/disgusted_tom_meme_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0582eba0-eeb8-4d10-a554-076d02960c71/bible_quiz_on_genesis_chapter_1_and_2.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/the_mortal_instruments_series_books.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/alimentao_saudavel_trabalho_escolar.pdfIn PDF document text
    • http://sebokegekesuded.atwebpages.com/ingilizce_zt_anlaml_kelimeler_listesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56aeb5df-043e-494d-80a7-f05d30e8bcc1/kitchenaid_stove_knob_parts.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_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 5244 bytes
SHA-256: 39a4c075bce2854c2bcef8f35bffc1df7bafd63a40b68bf13c637dded19c730d
font_01_sfnt_off0001012a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012A 10860 bytes
SHA-256: 1d489d18e57564ba7fb638412b27e6bc135a0a3e782a46823de36076e53453cd
font_02_sfnt_off0001265c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265C 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d