Malicious PDF — malware analysis report

Static analysis result for SHA-256 d188cfef79238953…

MALICIOUS

PDF

72.8 KB Created: 2021-04-27 14:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 19369e8af8f69a14c705de84e5941b48 SHA-1: b0faf982c0bed220b0308c91364f845cea9f4cf3 SHA-256: d188cfef79238953cb6285974eefae101c6e24738be0e672c310661bbce17128
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and is flagged by heuristics as a link farm designed for malicious purposes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pelibifir.ru/strik?utm_term=learn+english+grammar+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453906/normal_601aa09ff0b1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487200/normal_5ffac50f11cce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413570/normal_606ea0975da55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392857/normal_606e9f9bef962.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448137/normal_5fe1790c98da5.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/56838797808.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/biometria_hematica_nios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413454/normal_604511e593d88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394068/normal_600cb6888e654.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385014/normal_5fee77fac6d04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453532/normal_604e4a74ae86a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386609/normal_5fffc65a38e8e.pdfIn PDF document text
    • http://suxiselukex.66ghz.com/jejomuwikudoludix.pdfIn PDF document text
    • http://wepijafiguwenan.mywebcommunity.org/how_to_program_boss_gt_1000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380228/normal_5fdb0487d252c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485310/normal_6025cb2c5b3d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e860f1cd-5cdf-4b68-ac3c-f30b0b0bd568/el_pollo_loco_menu_megamall.pdfIn PDF document text
    • http://zumewozuzetarun.epizy.com/hollywood_bluray_movies_free_sites.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f51ca16e-27b0-48eb-9d7a-b73b8ac0b4ee/pretty_little_liars_the_perfectionists_season_1_episode_1_full_episode_youtube.pdfIn PDF document text
    • http://xerofefulut.rf.gd/find_percentile_given_z_score_ti_84.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed4087ff-2f6a-45eb-9740-fade99648912/patrick_rothfuss_wise_mans_fear_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15285664-2293-406f-9a82-806990a39ab6/prentice_hall_united_states_history_reconstruction_to_the_present_online_textbook.pdfIn PDF document text
    • http://miwewugewu.atwebpages.com/21550813236.pdfIn PDF document text
    • http://vafotapezetu.rf.gd/obras_selectas_edgar_allan_poe.pdfIn PDF document text
    • http://supajiwa.myartsonline.com/affairscloud_september_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64968aa9-ea1d-464a-9caf-a09edc858f62/rupofatujozawux.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_off0000df62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF62 5396 bytes
SHA-256: 62dad9c26dc7da8c53d434885f9fa89d0221b6d137734d32eab71a9912134a13
font_01_sfnt_off0000f194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 10476 bytes
SHA-256: 9cfecd88a32a7bd7e42631a446aa222393c5395c81d6f6c7625d3c492c937511