Malicious PDF — malware analysis report

Static analysis result for SHA-256 debdcb7b24bea23a…

MALICIOUS

PDF

79.6 KB Created: 2021-04-14 13:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ab9da3df505e2245836c682e33dfbc73 SHA-1: af42a89227762a74f25a510e9583bcbe4f9332df SHA-256: debdcb7b24bea23a8f640fc01fec5ad88986761f47c46703e1a7aa5679f6455e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. One primary URL, 'https://fokemale.ru/strik?utm_term=the+natural+bernard+malamud+full+text', appears to be a lure, possibly for phishing or SEO poisoning. While no scripts were explicitly extracted, the presence of external links and the ML classifier's high confidence score suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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://fokemale.ru/strik?utm_term=the+natural+bernard+malamud+full+text PDF link annotation
    • https://cdn.sqhk.co/tinolaseja/UhfuhgH/fireboy_and_watergirl_4_crystal_temple_kizi.pdfIn PDF document text
    • http://nuwetiveguvo.mypressonline.com/libertarian_paternalism_is_not_an_oxymoron.pdfIn PDF document text
    • http://tebapewulodafe.getenjoyment.net/zixevuxowatufuvuziketad.pdfIn PDF document text
    • http://vitetoka.scienceontheweb.net/kewuwitopabifunasa.pdfIn PDF document text
    • https://cdn.sqhk.co/tavanaru/haghoje/the_walking_dead_a_new_frontier_pc_requisitos.pdfIn PDF document text
    • http://busijizi.medianewsonline.com/perspectives_on_audiovisual_translation.pdfIn PDF document text
    • https://cdn.sqhk.co/rajunakeb/aEAFhcM/8386156453.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/5jgMifC/pokemon_home_app_ios.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xawiwevivuzox.onlinewebshop.net/sand_die_casting_process.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/manejo_de_ansiedad_y_estres.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/new_android_update_draining_battery_pixel_2.pdfIn PDF document text
    • https://451cdc1f-766e-44a1-8a9d-f9db2ecad5ed.filesusr.com/ugd/0f0d48_282bb3a0a8b747a89b7cc17072091bd7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/vajijibudavewe.pdfIn PDF document text
    • http://tuxabatadifu.onlinewebshop.net/45983045117.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/34326405648.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/52329495154.pdfIn PDF document text
    • http://valupakukav.myartsonline.com/violin_exercises_to_improve_tone.pdfIn PDF document text
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_ff9f4dd7782f4dbb86fc6aa813cd393b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/vedolaronixapogunivekozam.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/how_to_guide_carb_cycling_made_easy.pdfIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_fe6319453d29492790819484c10e0c14.pdf?index=trueIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_b258112112ba48809a5e1151efd934c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liwafo/35280117089.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/college_english_placement_test_practice_questions.pdfIn PDF document text
    • http://lafagelupuf.myartsonline.com/sociologija_udzbenik.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA9 5124 bytes
SHA-256: abc4aff6b3269e1722d43f6ce450ed52ddbfabd264cc318ef02cb0f8b053d8fe
font_01_sfnt_off00010cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF0 10544 bytes
SHA-256: 86cca0a935ad12350f23481dcca551dbd4b4bf828d8d3dcbd7caa4f868ea4486

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