Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e681409693147f…

MALICIOUS

PDF

75.2 KB Created: 2021-04-21 06:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8cced0722f3c5dfd9a57cd1b93464f64 SHA-1: 2d8dbb41d3aca655044843cfd5bdda10f47bfa4c SHA-256: f6e681409693147fc48a80e876d9e4897f281bdc19a64119c4ad9b18ba4c4bb1
184 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded links, many of which point to disposable domains and redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection, likely to a phishing page or a second-stage payload.

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://yafferge.ru/strik?utm_term=song+of+solomon+5+7+meaning In PDF document text
    • http://brettlockhart.com/bitsler_bot_androidd0v3z.pdfIn PDF document text
    • http://xatakafigudu.getenjoyment.net/inquisitorial_procedure.pdfIn PDF document text
    • http://italysummer.fun/nasevegokixomecaiwm.pdfIn PDF document text
    • http://takovod.66ghz.com/71983913227.pdfIn PDF document text
    • http://antinomi.design/3689700183098qyt.pdfIn PDF document text
    • http://barivelovone.22web.org/pawajudumo.pdfIn PDF document text
    • http://lixodamevurobar.mygamesonline.org/cuantos_cm_tiene_un_metro_cuadrado.pdfIn PDF document text
    • http://napufokotipo.getenjoyment.net/puwiz.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/business_plan_for_online_shopping_website.pdfIn PDF document text
    • http://lopitimew.mygamesonline.org/advanced_cardiovascular_life_support_provider_manual_free.pdfIn PDF document text
    • http://tophomework.space/how_to_test_furnace_limit_switch_with_multimeternkrt6.pdfIn PDF document text
    • http://dressnbuy.com/bose_sounddock_series_iii_digital_music_system_reviewx4ez9.pdfIn PDF document text
    • http://figejewumoposes.getenjoyment.net/atomic_structure_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kigexozuzexozo.rf.gd/nujujafekames.pdfIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_26387bb46955496ea301ef9a1350d888.pdf?index=trueIn PDF document text
    • http://ligiwekuxote.myartsonline.com/42626054540.pdfIn PDF document text
    • https://951e66c5-660f-4748-bfcc-a6cc0831133d.filesusr.com/ugd/4967bb_c2708be69f864a01a9747a43a2874b78.pdf?index=trueIn PDF document text
    • http://duvodix.myartsonline.com/rca_galileo_reviews.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 5300 bytes
SHA-256: fb81f089f2adb2db2ac77d151a05c39d8a52e5cd6283a69e50046c1374223703
font_01_sfnt_off0000f8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C5 11496 bytes
SHA-256: b71cd3924861823598ac2e0121235224cb523e7fa15a18df2b51b3a6a2658730

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