Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb855a7d4158bb0…

MALICIOUS

PDF

74.7 KB Created: 2021-05-16 22:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5962f4c56af63c72b966d70a624cbd26 SHA-1: 730c0ad2710825028345a2cdd838c6b43424a8c8 SHA-256: 6bb855a7d4158bb074f6dbf1d1396920897a5b7d15bd26c854830f4c9fafcfa9
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://midufefew.ru/strik?utm_term=imagenes+de+medios+de+transporte+terrestre+para+colorear PDF link annotation
    • http://lightstart.xyz/how_to_use_milk_and_honeyrnalr.pdfIn PDF document text
    • http://euromarket.pro/234564162813pebw.pdfIn PDF document text
    • http://texivej.sportsontheweb.net/13169339511.pdfIn PDF document text
    • http://presente-top.store/dukudaxifobotuwakhsiv4.pdfIn PDF document text
    • http://magexaxajatadog.getenjoyment.net/caracteristicas_gerais_das_angiospermas.pdfIn PDF document text
    • http://dovujaxemedu.mygamesonline.org/computer_important_full_form.pdfIn PDF document text
    • http://sallles.ru/46587776303kplxi.pdfIn PDF document text
    • http://sopugepibimel.mypressonline.com/grammar_worksheets_for_primary_students.pdfIn PDF document text
    • http://mon-cmso.best/vejazojinixekodakiniwaeu9ns.pdfIn PDF document text
    • http://viwavidif.getenjoyment.net/40987703959.pdfIn PDF document text
    • http://voicebftyi.com/technivorm_moccamaster_59616_kbg_10-cup_coffee_maker_40_oz_polished_silvertjgan.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
    • http://xakizuwebinul.rf.gd/data_structures_interview_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/whats_in_the_sky_tonight_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/soundlogic_xt_charger_manual.pdfIn PDF document text
    • http://gevejonitu.onlinewebshop.net/washington_gas_rate_increase_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/bejeweled_classic_patched_apk.pdfIn PDF document text
    • http://pizitibasowu.atwebpages.com/71630660321.pdfIn PDF document text
    • http://kadegezopofog.rf.gd/95426917261.pdfIn PDF document text
    • http://gakamaxoluzes.atwebpages.com/98705059592.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 5116 bytes
SHA-256: 0158d37d8504fe4c407a82688fff73d0dfa659069d4bdf9658fca1bade2774ab
font_01_sfnt_off0000f193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 10748 bytes
SHA-256: 810c663e901dc914c536fdb397e6f48fe71017015b8891b56679bbd178d33617
font_02_sfnt_off0001146c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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