Malicious PDF — malware analysis report

Static analysis result for SHA-256 1870f8a17ebe4c44…

MALICIOUS

PDF

77.9 KB Created: 2021-05-20 03:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3062d483e21a95d38b6f4c53cc5f4260 SHA-1: 90b71b15544ef4da286311927d791d76f8826038 SHA-256: 1870f8a17ebe4c44677249350947f790a96ce7e6516fccf2d9d1d5c2cfa1835a
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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://crophysi.ru/strik?utm_term=dost+exam+reviewer+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412592/normal_5fd9628147f81.pdfIn PDF document text
    • https://pidowiwosuzaji.weebly.com/uploads/1/3/0/9/130969191/193999e82af.pdfIn PDF document text
    • https://rojogude.weebly.com/uploads/1/3/4/3/134396813/cb78ffc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392867/normal_6014ed7bd8d35.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/8bd2d56f-4d35-41a3-97f3-a86bbf2b22de/79521412602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3b6453f-b25c-4ceb-a6c7-b61065e06f9e/41987927211.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d951bad-824f-4d3a-b1ea-6f5f41ac84ec/how_do_you_reset_the_water_filter_light_on_a_kitchenaid_refrigerator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8810f8f2-7153-48fc-ad5f-ed862f7a59db/jotuxarasumofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/475dedca-3f59-4f48-bc00-d45704bcdee0/45900740877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da2a35dc-c195-4b08-9a34-d2921ccba301/which_african_country_has_the_largest_economy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1320d2fb-984b-448e-8d64-0026cbd4ea3b/33373533440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5431a1e0-469a-4942-991a-c7991e9f901e/21155531112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b7c8d57-c458-4c73-bbda-10e339ba235a/vugovid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0ecf8ce-6c83-4967-9fc6-f838e7ee4e31/lowobedegilozalixibow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e284dd04-c8a0-4337-84ca-a123bf0a6183/29483714318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63b18202-3a66-44df-87ad-116b36b1c784/gupofododukokituzujegoriw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/090dee34-1c3c-44f2-b232-eb61f422f6ee/maslow_a_theory_of_human_motivation_publisher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb9f0c6c-7d8a-43d0-acfd-c151bfdc665a/egyptian_name_for_winged_sun_disc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ab4e35d-f793-4cf3-99d7-9e0a1e1d164d/zerigiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec33109f-c1d3-46d3-a452-4db803cfc835/icewind_dale_walkthrough_vale_of_shadows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5adcb96-4da4-4f57-9b42-341ae57c11a6/wakovunuredopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/657ad8f9-bbaf-438a-bcb1-2cdbe88548e1/woletuxifetufoxivovumap.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_off0000e4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DE 5184 bytes
SHA-256: b014e0499aa45eef03e15308d3a1912484c4aa9144d7b59d0d8aacebbee7886e
font_01_sfnt_off0000f69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69B 11048 bytes
SHA-256: 20ce4804341f40d6c1b38119520d2faf1681af49c6088759b5173ab1a4a3aa0d
font_02_sfnt_off00011c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C34 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333