Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb282d0378bf95d…

MALICIOUS

PDF

76.5 KB Created: 2021-04-08 16:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f0547c2d5a4fe3e1d46014dda0abd8a7 SHA-1: 2cb97476bcbd4af44f155ea05f4dd0ac16daef2b SHA-256: deb282d0378bf95de7d5d1b2a9607859c6a90a065698fe920322d83b37793bb3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/strik?utm_term=what+helps+relieve+plantar+fasciitis PDF link annotation
    • https://cdn.sqhk.co/tapowifilez/bj0fbgh/turn_traffic_sign_crossword.pdfIn PDF document text
    • http://disozire.mygamesonline.org/79410851826.pdfIn PDF document text
    • http://malalij.iblogger.org/how_to_write_news_report_example.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/jahjjgq/titunamosasikiw.pdfIn PDF document text
    • https://cdn.sqhk.co/furigelo/xqhakic/kajumagumomadevuje.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/eggjcu6/duwegodomotorefamem.pdfIn PDF document text
    • https://cdn.sqhk.co/kuniremolu/hc6hKgg/the_sims_freeplay_vs_the_sims_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/duj73hc/86240516399.pdfIn PDF document text
    • http://wusokamojifel.scienceontheweb.net/70260743171.pdfIn PDF document text
    • https://cdn.sqhk.co/rujamuzizogo/hibMDhg/examples_of_home_answering_machine_messages.pdfIn PDF document text
    • https://cdn.sqhk.co/wanaxowuwot/bDZ39gj/black_friday_2020_tv_deals_amazon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c0a42e0f-4cce-4e1b-84a6-2a5440198d67.filesusr.com/ugd/440b6d_fdb5bc79108f401f83d5bb2d45dbbd4b.pdf?index=trueIn PDF document text
    • http://xemunebo.atwebpages.com/journal_el_watan_aujourd_hui.pdfIn PDF document text
    • http://denuzux.epizy.com/ncert_sociology_book_class_11.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/ginirof.pdfIn PDF document text
    • https://19004eff-8f5e-45b0-b15a-9fbdbd99e39d.filesusr.com/ugd/578ea4_03211c6c7c9f4696810655c49ee7a663.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/citizenship_fee_waiver_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/74166549100.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/42503800124.pdfIn PDF document text
    • http://muwalolerede.epizy.com/annihilation_of_caste_br_ambedkar.pdfIn PDF document text
    • http://bifagogop.epizy.com/binary_system_in_computer.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_acb44a96d6f94aacb4c458377868025a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dupula/scratch_record_sound_effect_free.pdfIn PDF document text
    • http://kiwozoma.epizy.com/75960807169.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_off0000ebd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 5176 bytes
SHA-256: b089d5b33ff3c53ccb6d39dc2e559eeff7055034b962326a89f780ff2a739a26
font_01_sfnt_off0000fd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7F 10916 bytes
SHA-256: b444007eb45c146a90b9de1c651ebaac92c947eab857f276145a9e0e7c8f23ac