Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1dee0419fd738c…

MALICIOUS

PDF

81.0 KB Created: 2021-03-09 22:42:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 50dd899262beb38ec56030cd9c6bea63 SHA-1: 536fd11258cf182f0fe26276a642848f1f1989b3 SHA-256: 9a1dee0419fd738cf8f3811022ce7cb12e7106d5fdabde48462dfadb12884c41
146 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier strongly indicated maliciousness, and the presence of a lure to enable editing further supports a malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://kuzutuzo.ru/wix?keyword=service+manual+kitchenaid+mixer+professional+600 PDF link annotation
    • http://xiwesesakuvel.medianewsonline.com/5930509999.pdfIn PDF document text
    • http://mosomupusafebin.medianewsonline.com/riwedezudatovodu.pdfIn PDF document text
    • http://lexidubug.22web.org/jesus_calling_sarah_young_book.pdfIn PDF document text
    • https://ganipomadajo.weebly.com/uploads/1/3/2/6/132695424/kerijuvowed-zamotigujadat.pdfIn PDF document text
    • https://batopida.weebly.com/uploads/1/3/4/6/134689087/pipufipaxo-gativoxe-jadavuwuk-kazin.pdfIn PDF document text
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/4816f2702d56.pdfIn PDF document text
    • https://gonuxatokudegi.weebly.com/uploads/1/3/2/6/132695329/1876410.pdfIn PDF document text
    • http://takovod.66ghz.com/2015_audi_r8_performance_specs.pdfIn PDF document text
    • http://rujitexoxobag.mypressonline.com/63785047507.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_ece73eed958f4413ada8ed1e18f6fada.pdf?index=trueIn PDF document text
    • http://pelubameta.epizy.com/input_file_upload_only.pdfIn PDF document text
    • http://tidovikuvam.epizy.com/vamoj.pdfIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_5f5bc4605a144bf48e75307adb2de950.pdf?index=trueIn PDF document text
    • http://pevipitoz.atwebpages.com/wodijujewexulo.pdfIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_dc0b40662a1b4be5bf5fe6bf4fd108e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47cf1d49-9955-4da2-ab37-6ce3257a0dbf/17005407948.pdfIn PDF document text
    • http://zuxakenupe.epizy.com/square_root_symbol_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7486875c-2b54-40e2-bdd5-e71f3a3094a7/tifatonebeburofededotoji.pdfIn PDF document text
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_0ac52c1d6b504fdc848f1b04aa62b8c6.pdf?index=trueIn 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_off0000fc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 5984 bytes
SHA-256: 7308392ef5128b95e6f231169c60da881b3d26a4879fffeccf28548ad5b27843
font_01_sfnt_off00011078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11078 11260 bytes
SHA-256: beb62994eb212e94c577890712ec19eb63e30abddefa15503a7c40c1170c00d7