Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1861a8bbfe104a…

MALICIOUS

PDF

77.1 KB Created: 2021-03-11 04:21:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 11c356eab4cb0bce6cbefafd6af153ab SHA-1: b062fe51d1ff1513771f072be1c4741f888cf4d0 SHA-256: 2b1861a8bbfe104aa0cade27c35e7ee187bbaa55d7ad245e19f4e5931cc41836
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://pelibifir.ru/award?keyword=elements+of+solid+state+physics+rudden+pdf PDF link annotation
    • http://kalowodopole.mygamesonline.org/2017_amc_10a_solutions.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/overeating_anonymous_books.pdfIn PDF document text
    • http://gasomenuza.iblogger.org/inteligencia_emocional_definicion_segun_autores.pdfIn PDF document text
    • http://ramuwesitavoz.mywebcommunity.org/how_to_start_up_a_weil_mclain_boiler.pdfIn PDF document text
    • http://tagepalalog.iblogger.org/simple_addition_and_subtraction_worksheets_year_2.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://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_bb3b6cfca1bc4dbbad840e9bc7cf7f6e.pdf?index=trueIn PDF document text
    • http://besafetusupug.atwebpages.com/spoken_english_online_class_in_tamil.pdfIn PDF document text
    • http://xumugipetoje.epizy.com/guiding_questions_document_b_naacp_answers.pdfIn PDF document text
    • http://tekitizufexuwo.rf.gd/rijopadu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60fc9144-b4c6-4e9c-9a93-e34ff1d8090b/can_you_buy_replacement_parts_for_a_keurig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a161c514-e554-4123-83a7-3036d4709b25/a_arte_de_amar_ovidio_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a791ea47-c58c-41c3-8452-af6745e51e07/how_to_set_baofeng_uv-5r.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbfaec85-b81b-4069-b20d-dd3e3a2129ea/fourth_grade_grammar_worksheets.pdfIn PDF document text
    • http://sexexunila.epizy.com/67148260701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e9e40ab-dd23-4690-b74a-98a683cf1a16/xiwetima.pdfIn PDF document text
    • http://mitazojumate.epizy.com/kenmore_elite_smartwash_quiet_pak_9_error_code_dl_f.pdfIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_7ad159e663c24ec79cf964f89c7d65b0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b48fcf6-7319-487f-9564-4cf191d8e632/50129566459.pdfIn PDF document text
    • http://sowezenuvafe.epizy.com/pokemon_arceus_movie_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88835594-2bdb-447b-a769-63873b03a32f/35868634003.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/149c7d75-bec3-4175-a8be-d1bea1e9ae67/smith_and_wesson_model_915_9mm_review.pdfIn PDF document text
    • http://ladinuronabo.epizy.com/75351611132.pdfIn PDF document text
    • http://kuvepagigifu.rf.gd/75889873879.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93ffd569-81fb-4209-8ab4-3a2085ef17ab/pexatafasitoretubuxomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18ad1c39-db55-4fbf-8d3a-37d0d78db7ba/how_to_reset_magic_chef_portable_ice_maker.pdfIn PDF document text
    • https://e42ce0b3-f376-4cb5-9abe-507fdbb9570c.filesusr.com/ugd/603474_c2745a0c522c41a6b7595307f39fdc4e.pdf?index=trueIn PDF document text
    • http://zunuwovadete.epizy.com/let_us_create_man_in_our_image_hebrew.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_off0000e25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25C 5336 bytes
SHA-256: e585a0eb1f319154c812ef7fc81f5cabd11bde6cdbeceeec65849f1b0a01ed0d
font_01_sfnt_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 10480 bytes
SHA-256: 31f679957e8a32a9c4c306aed12a5aa7874915590ddc5bd7b166cdf350adfd02
font_02_sfnt_off00011839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11839 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34