Malicious PDF — malware analysis report

Static analysis result for SHA-256 58936e3f0ea1a229…

MALICIOUS

PDF

92.1 KB Created: 2021-03-11 16:52:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: f9917432427b8bd564244f407a39a596 SHA-1: 9510abf25fcf843ee66c73ae12fee6186572fbb4 SHA-256: 58936e3f0ea1a2293537495215d328a261357170fdbe8b4685e6dc6137f94510
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a common tactic for SEO link farms and phishing. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of links hosted on disposable domains, suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a lure to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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 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://xezojetit.ru/award?keyword=medicare+card+application+form+pdf PDF link annotation
    • http://sawedes.mywebcommunity.org/brother_hl-l2380dw_scan_software.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/wukulufi.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/beats_by_dre_studio_wireless_adapter.pdfIn PDF document text
    • http://pinegobojefo.getenjoyment.net/68334888206.pdfIn PDF document text
    • http://tajumizigareni.iblogger.org/best_books_for_15_year_olds_2019.pdfIn PDF document text
    • http://runaxok.iblogger.org/sri_lakshmi_sahasranamavali_in_telugu.pdfIn PDF document text
    • http://zuvatewovu.scienceontheweb.net/wilton_6b_size.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://derijumofode.rf.gd/60806619950.pdfIn PDF document text
    • http://rexamif.epizy.com/digidesign_002_rack_review.pdfIn PDF document text
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_b9ac12fb08c04a518f7fcc568f58aa3f.pdf?index=trueIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_f1137ac7bcc0470eb58802528a0b44e8.pdf?index=trueIn PDF document text
    • http://tawexega.epizy.com/waze_android_auto_non_funziona.pdfIn PDF document text
    • http://risitikavaj.rf.gd/13._1_fluid_pressure_worksheet_answer_key.pdfIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_226c0f92cfb04b1dab7bd3851101e009.pdf?index=trueIn PDF document text
    • http://setuvufijub.epizy.com/zegudovipolasowit.pdfIn PDF document text
    • http://vomematomeze.epizy.com/51725632774.pdfIn PDF document text
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_a43d36e8a3f549b2939cb95020f09d74.pdf?index=trueIn PDF document text
    • https://e2a1644f-80a1-4e08-b528-14b2d3f4d29c.filesusr.com/ugd/1d3654_40ce76a476da42b0a05efe0bfac0c79d.pdf?index=trueIn PDF document text
    • http://varoniwarovez.rf.gd/2193830415.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_1fac8694393b435abb834737d4614d5c.pdf?index=trueIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_9cba9b2d17d44af2b275a4f943bb8170.pdf?index=trueIn PDF document text
    • http://vonolukover.epizy.com/esl_crossword_puzzles.pdfIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_4ce99e43e84f4f2ca460b54a80381f3d.pdf?index=trueIn PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_2f78b747749641d58b3879802f5486b6.pdf?index=trueIn PDF document text
    • http://xefujexomige.epizy.com/chiku_chiku_bandi_song_free.pdfIn PDF document text
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_f8405ca5088e43f7be9e0432e047a0c9.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAA 5128 bytes
SHA-256: ee3af20fdca4a84569b95897af6b40ca07ab3e506996218a7fe79dde5679a7a7
font_01_sfnt_off00013e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E19 10728 bytes
SHA-256: a9a680d538dad4b0e154993787321df31390a54fbec3a5c8f2500cfe51f4534b

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