Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf895eae57d0f413…

MALICIOUS

PDF

84.8 KB Created: 2021-03-30 11:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3220cddd5c8ba5f1f0e99170f89727f9 SHA-1: b4f6834d06af78332575681e9241f05747a9180c SHA-256: cf895eae57d0f413687e32adc6df8c1a44bb3fb1923195653ce8b1fdccac5796
184 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics further confirm its malicious nature. The document body, though heavily obfuscated, appears to contain keywords related to software and fonts, suggesting a lure for users to click on the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=vivaldi+font+photoshop In PDF document text
    • https://cdn.sqhk.co/sejarepezibo/idNgexP/kofenelokojovijasutim.pdfIn PDF document text
    • https://cdn.sqhk.co/fedugaxoloz/ibwifSI/zaposodetilu.pdfIn PDF document text
    • http://rovanenafet.getenjoyment.net/cursos_de_ingles_basico_para_principiantes.pdfIn PDF document text
    • http://jojazinex.mygamesonline.org/81328687991.pdfIn PDF document text
    • http://dabutaxezopis.iblogger.org/48629937827.pdfIn PDF document text
    • https://cdn.sqhk.co/gibiganegaz/VYhdC3S/munowetasafiw.pdfIn PDF document text
    • https://cdn.sqhk.co/bepeguvovori/jcrjdhi/guided_reading_activity_economic_systems_worksheet_answers.pdfIn PDF document text
    • http://bejojutota.iblogger.org/what_another_word_for_touchdown.pdfIn PDF document text
    • https://cdn.sqhk.co/nikofejujel/KThcnG1/ubuntu_12._04_lts_desktop_iso.pdfIn PDF document text
    • http://sosutisokalelul.iblogger.org/black_boy_chapter_1_summary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_cc91dd7fc09949298dd85d8fd854ac72.pdf?index=trueIn PDF document text
    • http://beduxuluwuniva.rf.gd/75580202094.pdfIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_4c79a122dad6426298863d80c47c5ffb.pdf?index=trueIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_8d5baadb47a64e9089b729f80dc4f9e3.pdf?index=trueIn PDF document text
    • http://tapejufujol.epizy.com/strava_cycling_app.pdfIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_4a6c8e5a9739435fac7123d60deb66e4.pdf?index=trueIn PDF document text
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_24319617db5f4e268e4fdf095a79aebd.pdf?index=trueIn PDF document text
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_e48e10e496524a6e8c954a69cdbcb72a.pdf?index=trueIn PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_540a1806d6cb431586f65c98ded10f98.pdf?index=trueIn PDF document text
    • http://lebusepuwiri.atwebpages.com/lapoxubovogadusivinuxinet.pdfIn PDF document text
    • http://surafupomef.epizy.com/rodaradibo.pdfIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_513e18e0b0b44bcd92685371339d9030.pdf?index=trueIn 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_off000110ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AE 5060 bytes
SHA-256: e456c22c5a97dd126d328eb5becaa48d70f268086713adc918c4db3d7f80bb47
font_01_sfnt_off000121ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EE 10600 bytes
SHA-256: bf603daf4589e9eb7b2ff654011b5ea32d7af6493987154e434b54c285ba75d4