Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c0e0dbb663e0e6…

MALICIOUS

PDF

85.5 KB Created: 2021-01-20 10:59:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 8bfffc5d24e1f14ea2cb3991628c6352 SHA-1: 1c0603188930c2fb3a8bd5fd0513cc0f6f65de73 SHA-256: 67c0e0dbb663e0e6972739a74bea3519a81a71e3f9b37a6e99942d19fc0a668e
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm and employs a password-protected archive lure, suggesting it's designed to trick users into downloading further malicious content. The embedded URL `https://druttle.ru/123?utm_term=http+proxy+injector+for+windows+pc` is a primary indicator of the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/123?utm_term=http+proxy+injector+for+windows+pc PDF link annotation
    • https://site-1246089.mozfiles.com/files/1246089/fixigiradunav.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzesowasu/cNjdiaQ/tmnt_brothers_unite_apkpure.pdfIn PDF document text
    • https://site-1175393.mozfiles.com/files/1175393/nigevafub.pdfIn PDF document text
    • https://cdn.sqhk.co/kimamena/NhhLjbP/tigafexutakokaximo.pdfIn PDF document text
    • https://cdn.sqhk.co/wiparodub/7FDOib7/modern_warfare_3_ps4_store.pdfIn PDF document text
    • https://site-1167941.mozfiles.com/files/1167941/griseofulvin_bnf_interactions.pdfIn PDF document text
    • https://site-1196831.mozfiles.com/files/1196831/34354056295.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/a2fToig/semasozazanoto.pdfIn PDF document text
    • https://cdn.sqhk.co/jivobukafon/dNiihdy/61129073296.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/dEhhWig/common_aquarium_fish_crossword_clue.pdfIn PDF document text
    • https://site-1166710.mozfiles.com/files/1166710/formula_amounts_by_age_ml.pdfIn PDF document text
    • https://cdn.sqhk.co/pavoraxebute/gfkHrCT/77156599054.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/PYiegvF/ditoserap.pdfIn PDF document text
    • https://site-1174921.mozfiles.com/files/1174921/gejomifoja.pdfIn PDF document text
    • https://site-1179507.mozfiles.com/files/1179507/bhavesh_joshi_superhero_free_full_movie.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jebokizez/constitutional_convention_debates_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/diabetes_management_guidelines_ada.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/desajibolezurugegal.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/xoritijusujuruwos.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/dobosaponipuxedixumutare.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/inrix_traffic_report.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000fb4e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFB4E 14104 bytes
SHA-256: da51bc1c9607e7da7fdc08b791281ce375ee032ececf8a8b6d5978830e3562c7
font_00_sfnt_off0000e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 5208 bytes
SHA-256: 51daffe2f3e7446e35a1d64682c28d6c28a9635eedd87735a5ab4ddf33c27444
font_02_sfnt_off00012313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12313 10776 bytes
SHA-256: d8b659963139c9751dcb7ceb987bc890963c25e68cb6b6e4bf3fef372edc0bcd