Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebdc96fba783d57c…

MALICIOUS

PDF

81.6 KB Created: 2021-05-29 07:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 1388a252710b924023cf7a36cc6512fd SHA-1: cee8357f36303833e6332ad39c9c8dc2a1d8b5c3 SHA-256: ebdc96fba783d57c1119333119cec8afba001b6c58ea82d129ef0dbd7a4bc13c
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm designed to redirect users. The primary lure URL, 'https://mezovuduw.ru/123?utm_term=cara++vsco+fullpack+gratis+android', is presented as a download for 'Cara vsco fullpack gratis android', indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • SEO-redirector lure link (multi-word utm_term) low PDF_SEO_UTM_REDIRECTOR_LINK
    PDF contains a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the search-keyword gateway used by the 'free document download' phishing family. Surfaced as an IOC; on its own this is a low-confidence signal.
  • 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://mezovuduw.ru/123?utm_term=cara++vsco+fullpack+gratis+android PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469135/normal_5feb87f7ab0ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390051/normal_5fd63a343d63b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453551/normal_5fcc0c28e7895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494668/normal_6017ff56e0560.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484641/normal_600ab426d976a.pdfIn PDF document text
    • https://gozerivolese.weebly.com/uploads/1/3/4/2/134265833/3817235.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380675/normal_5fe4a1aee6743.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403672/normal_6035aca665135.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/794450.pdfIn PDF document text
    • https://kifeketefisub.weebly.com/uploads/1/3/5/3/135347095/biluxabu_ruxofejobope_zefuviwijadebe_simugetitimiri.pdfIn PDF document text
    • https://ruzovaberup.weebly.com/uploads/1/3/4/6/134651658/xewokujevojewu_tibalupamimalo_navigixatanul_lukoximawuzow.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
    • https://uploads.strikinglycdn.com/files/4fbfe22e-25b2-4f8f-be3f-8532e06d3e6d/baby_shark_trap_remix_audio_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb75f8b1-1605-4bb6-8b4d-9f747d5bcae0/reasoning_and_military_aptitude_test_for_afcat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4645fbc-30e2-4ef2-b42b-62f7cc3ad7f6/how_to_open_a_speed_queen_commercial_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48431c9b-77b1-4ae0-8898-e94384df5eda/how_to_use_self_clean_on_kenmore_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb9ff27c-8d3f-42d7-a1bc-f76cbd36eeb2/the_professor_and_the_madman_movie_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bb31523-79bc-4410-b0a2-326bd27bd68f/posirutudaxurige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d56ed6f-1797-4895-8551-72c8a89becca/network_security_key_on_spectrum_router.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66f79c63-ca9d-4c49-af3e-dc9d9793f6ac/asus_dsl-n66u_firmware_download.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_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 5232 bytes
SHA-256: 1164d64ef588f0e0493cc21c35f5dd124ce725372a67adc9afc6b0d661962fe2
font_01_sfnt_off000103a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A5 11144 bytes
SHA-256: d4d3fcb20d6ae59c2dda3f5037083f3c7c7697b567f4b16a0dc7dbc226fa7dbf
font_02_sfnt_off00012988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12988 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3