Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f8cbc5316dcf53…

MALICIOUS

PDF

47.7 KB Created: 2020-10-15 08:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 5829c02e0e2325da8e0162896dbf3afc SHA-1: a2a3dffe4d0d3d2e90680c7b807daac3383a62b9 SHA-256: 82f8cbc5316dcf53acda6ceb05dff0776fb9b7667cb4b5b347ffae6d19da9302
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://ggtraff.ru/pify?keyword=reduce+pdf+file+size+acrobat+standard+dc In PDF document text
    • https://site-1038519.mozfiles.com/files/1038519/30998203451.pdfIn PDF document text
    • https://site-1038573.mozfiles.com/files/1038573/lenakos.pdfIn PDF document text
    • https://site-1039226.mozfiles.com/files/1039226/gebutozuj.pdfIn PDF document text
    • https://site-1040341.mozfiles.com/files/1040341/90390951911.pdfIn PDF document text
    • https://site-1038407.mozfiles.com/files/1038407/81592586039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f87b5cccaa1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f8715a16d50a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368471/normal_5f87b941d4552.pdfIn PDF document text
    • https://site-1039400.mozfiles.com/files/1039400/90958668997.pdfIn PDF document text
    • https://site-1040571.mozfiles.com/files/1040571/mozuwozufewa.pdfIn PDF document text
    • https://site-1041587.mozfiles.com/files/1041587/sijanobanesij.pdfIn PDF document text
    • https://site-1042107.mozfiles.com/files/1042107/85093861935.pdfIn PDF document text
    • https://site-1040288.mozfiles.com/files/1040288/fire_sprinkler_system_design_calculation.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://cdn.shopify.com/s/files/1/0429/9423/7593/files/dufudowinozi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6029/2515/files/cycle_country_atv_plow_skids.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9066/3832/files/72880468715.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8203/2308/files/didupetasoved.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/100aefbf-8d4f-4ccf-a8d7-500af5ea19e3/kelomiforudur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6081b09e-299c-4636-9172-2fca5ee8afb9/68357132816.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f99d51b-3631-4503-a0ed-79af374b11a9/rulepuli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81467762-bdd4-45b0-8548-0e0f4e874f09/pabaxizul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d177b0-6a0f-48a0-9c78-06472ba021d3/58611531637.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_off000063e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E3 5228 bytes
SHA-256: 989ad40aa0336a8055975e371af304f02631445fd905eea5dc1db827e09ddec6
font_01_sfnt_off000075b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75B5 14368 bytes
SHA-256: ed593ccd93597d6498054266fde1c32d5e6f5825dc5a8049969a0eddc21db97d
font_02_sfnt_off0000a270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA270 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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