Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc204002e0e78ade…

MALICIOUS

PDF

78.8 KB Created: 2021-04-01 20:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 45ec09f91be9cb796dff7b70441052f1 SHA-1: ccb5b53e45bb1d7b31ba06fb3cc29a677f2c99b9 SHA-256: dc204002e0e78adedb9f1afb1d8fa300ba6aac2749d482c46e6637a575f9f114
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with at least one pointing to a suspicious domain (jacksth.ru) that is likely used for phishing or malware distribution. The PDF's structure suggests it's designed as a link farm, potentially to manipulate search engine results or redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://jacksth.ru/strik?utm_term=just+dance+can%2527t+stop+the+feeling+trolls PDF link annotation
    • https://cdn.sqhk.co/wepunajexiju/cihAgc5/sculpt_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rifebonapesi/ci8I0jf/rugavuzafepesatuturaweta.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/JieifKu/clean_out_3d_printer_nozzle.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471488/normal_6056737d31955.pdfIn PDF document text
    • https://cdn.sqhk.co/xudogafu/iVjaieH/kindle_cloud_reader_location_windows.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_7b81d2298b404e0795921940507cea08.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5ded132-3313-4f5a-ab87-e92f1223884f/weider_8630_workouts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47b6b56f-de98-49de-8c49-590ae829e674/detilewofodorodupe.pdfIn PDF document text
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_18f2861d2bc443ffac81ad48b04f465f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/what_does_chevy_flex_fuel_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef075a9e-4c0b-4e2f-a004-2e4e7a59716f/the_giver_book_and_movie_comparison_worksheet.pdfIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_dc552a05aa6943edae2a6166fec1f813.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/lijowipok.pdfIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_bf1c409dca7346e3bf2f7c59815679c9.pdf?index=trueIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_48a96431cc1b42df826f074bdbf5f5d3.pdf?index=trueIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_4c40de56834f470d9a6c05bd67d9b91e.pdf?index=trueIn PDF document text
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_a1b72a949f3f4ba291244a3c10a0e0f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ada3d54-d0e2-4abf-aadf-64d7b7105259/3346349076.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/20229093772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aea76030-44df-49b3-a9a3-f2f768c4c6d2/arctic_king_8_000_btu_portable_air_conditioner_white_reviews.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_ed87c6de6d2b4e8181320b5d40305bde.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C9 4368 bytes
SHA-256: aa469030ac96d93ae6670c7796167d4f0085cadbf37c27b38622b1e87ad793ff
font_01_sfnt_off0000f5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 5440 bytes
SHA-256: f171dc3f3a1aa821c8328868c16400d080213a796309a1dafa645efa7aed6520
font_02_sfnt_off00010874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10874 10688 bytes
SHA-256: 8e2095995971956279c0e6edd302abcd16a6888232ff3ce4699dd8bc1b5572e3

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