Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c75eed999f41c7…

MALICIOUS

PDF

80.4 KB Created: 2021-03-31 12:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3299ee0719bb4f0397d4dfe5ff55a03f SHA-1: d2b027cb0104984c98f6d882d09fa14fbe289f5e SHA-256: 12c75eed999f41c7133dac475fcf548524de0abc0eb4864afaef2c894c34526a
184 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and is flagged by an ML classifier and ClamAV. The embedded URLs, such as 'https://dafemum.ru/award?keyword=princeton+review+gre+practice+test+pdf', point to known malicious redirectors and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL analysis strongly indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=princeton+review+gre+practice+test+pdf In PDF document text
    • http://apkweb.net/lusikunavvzr4k.pdfIn PDF document text
    • http://teplotronic.ru/65849974154rrphl.pdfIn PDF document text
    • http://smartcreditcheck.info/padi_rescue_diver_exercise_2301s4.pdfIn PDF document text
    • http://gonzo-3d.com/schematic_design_guidelinesaigwv.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/K4Vlhij/cowboy_hats_near_me_pink.pdfIn PDF document text
    • http://vashmaster.info/48826464132qxsis.pdfIn PDF document text
    • https://cdn.sqhk.co/gilitejeku/p68UXhc/51675957861.pdfIn PDF document text
    • http://online-sistem.site/free_download_sat_sample_papersabqza.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/hbdjfAa/quran_in_english_transliteration_and_translation.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/isicZie/wikukuwativudizum.pdfIn PDF document text
    • https://cdn.sqhk.co/lekixubegewo/Ggiifjj/best_diesel_tuner_for_2018_6._7_cummins.pdfIn PDF document text
    • http://netewe9.xyz/219425038015ppmh.pdfIn PDF document text
    • https://cdn.sqhk.co/ketixudolu/Aiggfgi/ancient_civilization_history.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/hwgcMAI/19754498146.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gateme/36732568587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6c92be7-cc41-4966-9002-c07008529c22/tufijuludulixibudegezukis.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/bizasuzedewobeviwokij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/480833e5-d929-4b45-921f-645971b79aed/does_arctis_3_work_with_xbox_one.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/book_of_symbols.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/losogifivulusix.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/xovurizine.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 5232 bytes
SHA-256: 40ec19d955be20b75163afc184da60cdb03a6d5f5063447f1ba60ea0399e1190
font_01_sfnt_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 10276 bytes
SHA-256: 72f2cec777d4eae51febc3ec54b3add3c78173a235c73bfc78f6eee361f9d74b
font_02_sfnt_off0001249b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249B 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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