Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f4a6e90b8edc6f…

MALICIOUS

PDF

38.3 KB Created: 2020-10-02 05:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 2150ed191223fd6635ed70b9d42c419a SHA-1: dbcf1c5751ea2749e68c05e35b861a3ae8b65b70 SHA-256: 81f4a6e90b8edc6f740e439730dc3cd3269ab349ec946d5c9697e948425921a6
184 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.
  • 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.
  • 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=sas+72+comfort+letter+form In PDF document text
    • https://site-1037157.mozfiles.com/files/1037157/penikiragukoxifomikufu.pdfIn PDF document text
    • https://site-1036630.mozfiles.com/files/1036630/74043789754.pdfIn PDF document text
    • https://site-1040319.mozfiles.com/files/1040319/wozavujuziz.pdfIn PDF document text
    • http://files.theearkchristianbookstore.com/uploads/1/3/1/8/131871568/f6cd5528945fb.pdfIn PDF document text
    • http://kowilobij.amazingeventrentals.com/uploads/1/3/1/4/131406841/janivuwegegoxut.pdfIn PDF document text
    • http://woduro.jeffcrowell.com/uploads/1/3/1/8/131857631/datikuvabapobisi.pdfIn PDF document text
    • http://sixezegob.threadsofmeaning.com/uploads/1/3/2/6/132695517/4336089.pdfIn PDF document text
    • http://files.la-enthusiast.com/uploads/1/3/0/7/130739781/gomesed.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/0aa1d253-b715-4a9f-83c4-aaca84840b57/89844457153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0e938ed-ef58-4b8b-8f94-0e2efe1f36de/nunumod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85ac92f1-455b-4b9d-91c5-478536791671/1612073459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cce028ec-5892-4ab1-87b9-2a900c716d4b/43540242742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/980010a9-fc0e-4e82-afce-4ece8ae06db1/31874711468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18d39147-eaf3-4182-ae0d-f21a7d3f3817/nesewabudidupisabogawoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/220dd551-c2eb-4b57-b4af-35cbbcacd753/tagibufevudomuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ff768f7-9f1a-4e71-95ee-85b6257e071d/7259891864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8f6af34-7c1f-4db8-8d8c-fcfd52ba4b1c/1376814507.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_off0000599d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x599D 5340 bytes
SHA-256: 1a47989d42498f873aa5542bdabeb8f6c4627a3ef64895a45b9fe7e6cd80101a
font_01_sfnt_off00006bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB6 9580 bytes
SHA-256: 373f18310eb4465e39edb7e388255e15511f541f627177271bb1303bcce1dae9