Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb1778f0275486e…

MALICIOUS

PDF

81.8 KB Created: 2021-04-26 10:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8dbc4ba4e7bfe64ef693bdb85c137821 SHA-1: 4ce8b404fa1f74d0592be890856680c35da21b4c SHA-256: ebb1778f0275486e3ee8d896157632cecdffbefcb9c812c996bf3a78c06c3bfb
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it's a phishing or malware distribution lure. The document body, though partially corrupted, mentions "Oklahoma drivers license renewal grace period", a common lure for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=oklahoma+drivers+license+renewal+grace+period In PDF document text
    • http://fibakigefejep.66ghz.com/el_mundo_de_sofia_resumen_libro.pdfIn PDF document text
    • http://pisibebix.22web.org/32608657954.pdfIn PDF document text
    • http://zukapojijedolof.22web.org/mufupurilaxuwotusodomuxe.pdfIn PDF document text
    • http://gedatidigog.sportsontheweb.net/padoro.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/soft_skills_book.pdfIn PDF document text
    • http://roxedizusugu.mywebcommunity.org/indefinite_integral_ex_cos_x.pdfIn PDF document text
    • http://matawobedopikam.mywebcommunity.org/python_for_everyone_2nd_edition_free_download.pdfIn PDF document text
    • http://megaliwuxo.22web.org/asme_b16_34_2020.pdfIn PDF document text
    • http://jotetifijenosif.iblogger.org/beautiful_disaster_google_drive.pdfIn PDF document text
    • http://vedevejunogi.iblogger.org/oxford_dictionary_english_premium_apk.pdfIn PDF document text
    • http://ronutuvuvawudas.iblogger.org/aldous_huxley_obras.pdfIn PDF document text
    • http://setavifisotater.22web.org/yaseen_sharif_in_english.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://xotexipu.rf.gd/49310500152.pdfIn PDF document text
    • http://bawulega.rf.gd/geographic_information_systems_and_remote_sensing.pdfIn PDF document text
    • http://kubomefewofumim.atwebpages.com/gokugadosibanuxug.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/savukaki.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/a_g_e_ka_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/basara_apk_ppsspp.pdfIn PDF document text
    • http://gabifuzof.rf.gd/17879897434.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF086 5440 bytes
SHA-256: 323e4f758067f13474356b6bc1d3f045af224b61e190ae5d312ef188e224f423
font_01_sfnt_off000102f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F0 11328 bytes
SHA-256: 600059cd94b18e63ff3fdc2fa985473d2067206354a4e3f8df9b5d82e722464e
font_02_sfnt_off000129b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B2 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176