Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d6ab1bf2bfb4cda…

MALICIOUS

PDF

70.7 KB Created: 2021-03-25 08:45:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 668e8221746ef88d1642eaf7040df6d4 SHA-1: 9522738c7818589c5988dd075fad5f77691d1fb9 SHA-256: 2d6ab1bf2bfb4cdaa5f00df4aaa341d6d7f0b9ce8944df25fd1f24e0edaab2ee
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of an SEO link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=electrolux+fridge+manual+defrost
    • https://cdn.sqhk.co/melipetoluf/h6hbmQ6/lawn_mower_blade_hits_deck.pdf
    • https://cdn.sqhk.co/luwesefizi/2Ybvicg/jigut.pdf
    • https://static.s123-cdn-static.com/uploads/4416514/normal_6002e533b5b3d.pdf
    • https://static.s123-cdn-static.com/uploads/4421460/normal_5fe050288f149.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/564945e3-c755-4687-87a9-1c0e7afcbd34/world_war_z_movie_free_download_in_hindi.pdf
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_9e8c05d3a45b4257a1dd25cee253906d.pdf?index=true
    • https://s3.amazonaws.com/mukut/zebra_barcode_printer_software.pdf
    • https://s3.amazonaws.com/xugigabitulu/are_2006_pt_cruisers_good_cars.pdf
    • https://s3.amazonaws.com/wexukufedepim/hp_officejet_4630_e-all-in-one_printer_series_treiber.pdf
    • https://s3.amazonaws.com/muwomapotumugi/azure_sql_dtu_performance.pdf
    • https://s3.amazonaws.com/sivanira/40467284368.pdf
    • https://uploads.strikinglycdn.com/files/5c57b494-d0a9-4f5f-b820-b58cac5fdd9b/ms_excel_example_files.pdf
    • https://s3.amazonaws.com/xewamejixolefaj/44023165334.pdf
    • https://s3.amazonaws.com/wekibik/15149602575.pdf
    • https://uploads.strikinglycdn.com/files/5ae08dc3-05b3-4fe7-be77-de14cf4238d6/fish_hook_knot_braided_line.pdf
    • https://uploads.strikinglycdn.com/files/2650f6a7-f58a-4916-a672-50dc6a1beeef/32324310074.pdf
    • https://e2a12503-e9f4-4898-9b1e-00959bf5a9c8.filesusr.com/ugd/1f0de7_dfe7f52433564bf2b4a0a80d57b0495b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4fbd4455-0762-4297-a04f-fed027b98ef2/what_is_an_example_of_a_marketing_plan.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ce.bin
0a96e730d46d31fb21dfddf170847a39e9815b8f280aec7b627e19fe1d035471		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CE 5368 bytes
font_01_sfnt_off0000e6fd.bin
6a38bb18579061dba74ab9b9e3e4387e75ff97cfc9286f1c95244aa3a66cc983		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FD 10852 bytes

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