Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f3cc7f23ee640f…

MALICIOUS

PDF

54.0 KB Created: 2020-10-29 06:21:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 334eaf59e5f33d9cef981b4d7e1d0474 SHA-1: 58b9e74d373ed6270c0e75fa0de44dc9525a6ded SHA-256: 58f3cc7f23ee640fefa203656a45c4aec33f22d8eb64fb49e4fc0922d2feb8ed
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests an attempt to direct users to malicious sites, likely for further exploitation or phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/strik?keyword=theory+of+work+adjustment+values In PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/navoforiku.pdfIn PDF document text
    • https://ximazula.weebly.com/uploads/1/3/0/7/130738777/fupewenawamido_zukexidemekuja_sonekixebeni_sekorej.pdfIn PDF document text
    • https://tudasuli.weebly.com/uploads/1/3/4/4/134403402/koridoxug_dopukirup.pdfIn PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/18c886d3b1f6351.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dec77d7-441d-4dd6-b6e5-ca1bff28c43f/95628080354.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00821c49-5d99-473c-a795-2067a6c6dc4d/dark_elf_noble.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7493/7532/files/43024960008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aea6cccc-2865-4913-b086-d9cb0d7cbff0/besonufalesole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f100fba-44c8-42d4-bc1f-17e92cda0f0c/xizikekafipotewamidelusef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8976f9ae-4529-42bf-99c2-8cd356bd8e49/tewiduxolefedozimidatuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/2786/8059/files/app_banamex_movil_para_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/509a50ab-b5f6-46a6-9484-2855699882cb/steven_universe_obsidian_fusion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/7022/5060/files/interpersonal_communication_kory_floyd_chapter_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8d5bc1d-7d66-43ba-9d6b-ee21496d66e8/mythical_monsters_legendary_fearsome_creatures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21e269ba-3581-4d09-a5e7-fc35415a132b/83409816820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50e42308-5d48-4f05-ab83-4d9bd09c8b20/botw_energetic_rhino_beetle_farming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2110bdf-38f2-4b2a-9b90-6bd280886c4c/5937403605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db289165-7513-4298-967c-e559e52e8730/audacity_2.2.2_manual_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2e66356-58a0-47d5-8d9f-41478299d115/50703164875.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_off0000940b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x940B 5488 bytes
SHA-256: 511e3d76f8b438ec3409c58b5f5695077a9a30b8c967b1245fd26560fb35a6c6
font_01_sfnt_off0000a6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6B0 10624 bytes
SHA-256: 42c694748048b45e5027874b9b9a930f2418d450f0699f09d59b934839531095

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